Care, Size, Lifespan, Tank Mates and more! (2023)

Origin, appearance, size and shelf life

The Pygmy Corydoras, or Corydoras pygmaeus, is a favorite freshwater fish thatnative to the Upper Amazon basin of South America. You can usually find them in the tributaries of the Rio Madera and Rio Negro, which run through Brazil and Colombia.

In the wild, Pygmy Corydoras are often found in slow, shallow waters with lots of plants. These plants not only provide hiding places but also serve as a source of food, while dark riverbeds bring out their muted colors. These social fish thrive in groups of at least six, but it is not uncommon to see them in schools of 20 to 30 or more.

Their natural environment consists of warm, soft and acidic water. The temperature is usually between 72 and 79 degrees Fahrenheit (22 to 26 degrees Celsius), with a pH of 6.0 to 7.5 and water hardness between 2 and 12 dGH. To create a similar environment in your aquarium, maintain a constant water temperature, use a high-quality filtration system, and include live plants and driftwood.

By closely mimicking the natural habitat of Pygmy Corydoras and maintaining proper water conditions, you are preparing your fish for a healthy and fulfilling life in your aquarium.

Pygmy Corydoras are known for their small size, having a silvery body with a black horizontal stripe running from their snout to their tail. These subdued colors make them a subtle yet attractive addition to aquariums. Despite being small,reaching up to about 1.2 inches (3 cm) in size, their lively demeanor makes them an attractive choice for those looking for an active, exciting aquatic look. These delightful fish bring joy to observers as they playfully run along the bottom of the tank, making them a firm favorite among hobbyists of all experience levels.

With proper care,Pygmy Corydoras can enjoy a lifespan of up to four years. As social creatures, they thrive in groups and are best kept in schools of at least six individuals.To promote their welfare and ensure their longevity in captivity, it is critical to provide a richly planted aquarium with plenty of hiding places, as well as a varied diet consisting of top quality pellets, flakes and frozen foods.

fun facts

Now that we have learned more about the appearance and lifespan of Pygmy Corydoras, in this section we will highlight some fascinating facts about these charming fish that make them stand out in the aquarium hobby. From their small size to their social behavior, Pygmy Corydoras are full of surprises and are sure to enchant any aquarium.

  • The size matters:In the wild, Pygmy Corydoras are one of the smallest members of the Corydoras family. Their small size allows them to navigate dense vegetation and avoid predators more easily than their larger counterparts.
  • Defense Mechanism:Pygmy Corydoras possess a unique defense mechanism called odontoid processes. These are sharp, mobile spines on their cheeks that can be extended when they feel threatened, making it difficult for predators to swallow.
  • Air Ducts:Unlike many other fish, Pygmy Corydoras have the ability to breathe atmospheric air. They have a modified gut that allows them to extract oxygen from the air, which helps them survive in low-oxygen environments or when water quality is poor.
  • Acrobatic swimming:Pygmy Corydoras display a playful and acrobatic swimming style, often jumping up and down in the aquarium. This engaging demeanor makes them a delightful addition to companion tanks and a source of entertainment for their owners.
  • Team Dynamics:Pygmy Corydoras are social fish that prefer to live in groups. They are often seen swimming and foraging together, making a fascinating display in an aquarium. Their lively interactions and active behavior make them a popular choice among hobbyists.

Now that you've discovered some interesting details about Pygmy Corydoras, you'll be better prepared to appreciate their charm and complexity in your tank. In the next section, we will make recommendations on tank setups so that your Pygmy Corydoras have an ideal environment in which to thrive and display their lovable qualities.

Recommended tank settings

Each setup includes the essential components - tank, filter, heater, lighting, substrate and more - to ensure you can create a suitable environment for Pygmy Corydoras and other compatible freshwater fish species in your aquarium. As you move from budget-friendly to premium settings, you also have more options for customization, aesthetics, and advanced features. Pygmy Corydoras are social fish and should be kept in groups of at least six to reduce stress and ensure their welfare. Typically, Pygmy Corydoras cost between $2 and $4 per fish, although prices can vary depending on factors such as size, quality, and availability.

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Budget-friendly setup (around $200):

  • Tank:10-gallon aquarium with hood or glass cover ($20-$50)
  • Filter:Hung On Back (HOB) or Sponge Filter rated 10 gallons ($10 - $25)
  • Heating:25-50 Watt Adjustable Aquarium Heater ($10-25)
  • Relief:Basic LED Aquarium Light ($15 - $40)
  • Substrate:Inexpensive aquarium sand or small gravel ($5 - $15)
  • Decor:A few pieces of driftwood and rocks, along with inexpensive live plants like Java Fern and Anubias ($10-$25)
  • Vis:Min 6, Max 10 Pygmy Corydoras ($15 - $25)
  • Thermometer:$ 3 - $ 10
  • Substrate Blank:$ 10 - $ 25
  • withered:$ 2 - $ 10
  • Algae scraper of the magnetic cleaner:$ 5 - $ 20
  • Siphon and bucket:$ 10 - $ 25
  • test kit:$ 15 - $ 50
  • Seafood:$ 3 - $ 15
  • Air conditioner:$ 3 - $ 10

Mid-range setup (around $350-$500):

  • Tank:15-20 gallon aquarium with hood or glass cover ($40-$90)
  • Filter:Canister filter or high quality HOB filter suitable for tank size ($40 - $100)
  • Heating:50-100 Watt Adjustable Aquarium Heater ($15-35)
  • Relief:LED aquarium lighting with adjustable plant growth and color enhancement settings ($30 - $100)
  • Substrate:Nutrient-rich aquarium substrate designed for planted tanks ($15-$30)
  • Decor:A mix of driftwood, rocks and live plants such as Amazonian swordtails, Java Fern species, Anubias and Cryptocoryne ($20-$50)
  • Vis:Min 6, Max 15 Pygmy Corydoras ($20 - $45)
  • Thermometer:$ 3 - $ 10
  • Substrate Blank:$ 10 - $ 25
  • withered:$ 2 - $ 10
  • Algae scraper of the magnetic cleaner:$ 5 - $ 20
  • Siphon and bucket:$ 10 - $ 25
  • test kit:$ 15 - $ 50
  • Seafood:$ 5 - $ 20
  • Air conditioner:$ 5 - $ 15

High-end setup (over $600):

  • Tank:20-30 Gallon Rimless Aquarium with Glass Cover ($70-200)
  • Filter:High-quality canister filter suitable for tank size ($80-$200)
  • Heating:Adjustable 75-150 Watt Aquarium Heater with External Temperature Controller ($25-60)
  • Relief:Advanced LED lighting system with adjustable settings for plant growth, color enhancement and day/night cycles ($100 - $250)
  • Substrate:Premium aquarium substrate designed for planted tanks, with additional root tabs for extra plant nutrition ($20-$50)
  • Decor:A combination of driftwood, rocks and live plants to create a natural waterscape, with plant species such as Amazon swords, Java Fern, Anubias, Cryptocoryne species and carpet plants such as Dwarf Hairgrass or Monte Carlo ($40-$100)
  • Vis:Min 6, Max 20 Pygmy Corydoras ($20 - $60)
  • Thermometer:$ 3 - $ 10
  • Substrate Blank:$ 10 - $ 25
  • withered:$ 2 - $ 10
  • Algae scraper of the magnetic cleaner:$ 5 - $ 20
  • Siphon and bucket:$ 10 - $ 25
  • test kit:$ 15 - $ 50
  • Seafood:$ 5 - $ 20
  • Air conditioner:$ 5 - $ 15

Please note that these numbers are only recommendations and you should consider other factors such as mates and individual fish personalities when deciding how many Pygmy Corydoras to keep in your tank. Prices may vary by location, brand and availability.

Set up your tank

In the previous section, we discussed recommended tank setups for Pygmy Corydoras and other fish. Now that you have a better understanding of the requirements, let's dive into the step-by-step process of setting up your aquarium. These steps will help you choose the perfect location for your aquarium, clean and prepare the aquarium, install the necessary equipment, and circulate the water to create a healthy environment for your fish. We also discuss the proper acclimatization process to ensure a smooth transition for Pygmy Corydoras and other fish to their new home. By following these guidelines, you'll be well on your way to creating a thriving aquatic ecosystem for your fish to thrive.

  • Step 1:Choose an ideal place for your aquarium and make sure it is away from direct sunlight, heat sources and drafts. Make sure the surface is flat and stable enough to support your full container. If your aquarium requires a stand, assemble it according to the manufacturer's instructions and place the empty tank on top.
  • Step 2:Clean the tank by rinsing it with clean water (avoid using soap or chemicals) to remove dust and dirt. Wipe the interior with a clean cloth or paper towel. Rinse the substrate (sand or gravel) thoroughly in a bucket until the water runs clear, then spread it evenly across the bottom of the tank, creating a slight slope back for visual depth.
  • Step 3:Plan your aquarium layout before filling the tank with water, including the location of equipment such as heaters and filters. This simplifies tank setup and long-term maintenance. Install the heater and filter according to the manufacturer's instructions. If using a sponge or gravel filter, place it under the substrate before adding water.
  • Step 4:Decorate the aquarium with driftwood, rocks and plants to create hiding places and a visually appealing environment, providing open swimming areas for your fish. When decorating the tank, be sure to arrange driftwood, rocks and plants so that they do not damage or interfere with the equipment. You can also anchor plants to driftwood or rocks to keep them in place.
  • Step #5:Fill the tank with water treated with a water conditioner if your tap water contains chlorine or chloramines. Place a clean plate or plastic bag on the substrate to avoid disturbance during filling. Fill the tank until it is about 2/3 full. Attach the aquarium lighting to the hood or canopy according to the manufacturer's instructions. Consider using a timer for your aquarium lighting to maintain a consistent day-night cycle, which is vital for fish and plants. Connect the heater, filter and any additional equipment (air pump, CO2 system) to power sources and install the thermometer in a conspicuous place.
  • Step #6:Top up the water, leaving space between the surface of the water and the top of the tank for oxygen exchange. Turn on the filter, heater and other equipment. Monitor the water temperature and adjust the heating if necessary. Circulate the tank for 4-6 weeks to establish beneficial bacteria and stabilize water parameters. During the cycling process, you can add a bacterial starter culture to speed up the establishment of beneficial bacteria in the tank. Use an aquarium test kit to check ammonia, nitrite and nitrate levels.
  • Step #7:After the tank has been cycled and the water parameters are stable, slowly acclimate the Pygmy Corydoras and other fish to the tank conditions before introducing them. Start by floating the unopened bag of fish in the tank for 15-20 minutes to allow the temperature to equalize. Then open the bag and add a small amount of tank water. Continue adding small amounts of water from the tank to the bag every 5-10 minutes for at least 30-60 minutes to allow the fish to gradually adjust to the new water chemistry. Use a net to gently transfer the fish from the bag to the tank, avoiding undue stress or exposure to water from the bag.
  • Step #8:Once all the fish have spawned, establish a consistent daily feeding schedule, ensuring high quality food in the right amounts for your fish species. Perform regular water changes (20-30% every 1-2 weeks) and monitor water parameters using a test kit to maintain a healthy environment for your fish. Watch your fish closely for signs of stress or illness, especially during the first few weeks after introduction. Be prepared to take action if necessary, such as adjusting water parameters or seeking advice from an experienced aquarist.

By following this step-by-step guide and incorporating the additional setup tips, you can create a thriving aquatic environment that will help Pygmy Corydoras and other fish thrive in their new home.

Recommended water parameters

To keep your Pygmy Corydoras healthy and happy, it is important to maintain certain water parameters in your aquarium. Here's an overview of what to aim for:

  • Temperature:Keep water between 22°C and 26°C (72°F and 79°F) for optimal comfort.
  • pH:Aim for a pH of 6.0 to 7.5, with a preference for slightly acidic conditions.
  • Hardness:Soft to moderately hard water (2-15 dGH) is ideal for Pygmy Corydoras.
  • Ammonia, nitrites and nitrates:Keep ammonia and nitrite at 0 ppm and keep nitrate levels below 20 ppm.
  • Relief:Provide moderate lighting with shady areas and plants to avoid stress.
  • Water movement:Moderate water flow is best, mimicking their natural slow-moving habitat. Be sure to test your aquarium water regularly and perform any necessary water changes to keep the environment stable.

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Routine water maintenance

Water changes are vital to a healthy Pygmy Corydoras tank. They help remove unnecessary nutrients, waste and toxins. Here's a suggested routine:

  • Weekly water changes:Replace 20-25% of the tank water weekly.
  • Water parameters test:Check pH, ammonia, nitrite, nitrate and hardness regularly.
  • Use a gravel vac:Clean the substrate during water changes.
  • Dechlorinate the water:Treat tap water with a conditioner before adding it to the aquarium.
  • Temperature and pH adjustment:Make sure the new water is similar to the tank water.
  • Screw conditioner:Give your fish time to adjust to the new conditions after water changes. In addition to regular water maintenance, consider the following to ensure the health of your fish and the overall appearance of your tank:
  • Duration of lighting monitoring:Monitor how long your aquarium lights are on each day and aim for a consistent photoperiod of 8-10 hours. Too much light can lead to excessive algae growth.
  • Factory Maintenance:Trim live plants regularly to maintain their health and appearance. Remove any dead leaves or plant material to avoid water quality problems.
  • Filter Maintenance:Clean or replace the filter media as recommended by the manufacturer, usually every 4-6 weeks. Do not replace all filter media at once, as this can disrupt the beneficial bacteria and lead to water quality problems.

Diet and nutrition chart

Pygmy Corydoras are omnivores and need a varied diet. Here are some dietary guidelines:

  • flakes and pellets:Use a high quality flake or pellet food designed for small demersal fish.
  • Frozen and live foods:Occasionally offer blood, bay or brine shrimp.
  • Vegetable matter:Provide blanched spinach, zucchini or cucumber for extra nutrients.
  • Power Frequency:Feed moderate portions once or twice a day and avoid overfeeding.

Connectionand diseases

Pygmy Corydoras can experience stress from a variety of sources, including poor water quality, aggression, or inappropriate aquarium conditions. Identifying and dealing with these stressors is essential to the health and well-being of your fish:

  • Pay attention to stress signals:Watch your Pygmy Corydoras for unusual behaviors such as hiding, lethargy, loss of color, or rapid breathing, which may indicate stress.
  • Check water quality:Test your aquarium water to make sure it meets the ideal parameters and do regular water changes to maintain a healthy environment.
  • Watch out for your tank mates:Make sure your Pygmy Corydoras Corydoras are not harassed or attacked by other fish and remove any aggressive companions if necessary.
  • Create a suitable habitat:Provide plenty of hiding places, proper lighting, and an appropriately sized aquarium for your fish.

While Pygmy Corydoras are generally hardy, they can be susceptible to some common fish diseases, including:

  • I (white spot disease):A common parasitic infection that causes white spots on the body and fins, lethargy and loss of appetite. Treat Ich with aquarium salt or antiparasitic medicine and raise the water temperature to about 82°F (28°C).
  • rotten end:A bacterial infection that results in frayed or discolored fins and tail. Treat fin rot with partial water changes, aquarium salt, and an antibacterial medication containing erythromycin or tetracycline.
  • Velvet disease:A parasitic infection that causes a yellow or brown velvety coating on the body of the fish. Treat velvet disease with antiparasitic drugs containing copper sulfate or formalin.
  • Bladder disease:A condition in which fish find it difficult to swim upright. Treat bladder disease by fasting the fish and feeding them blanched peas, and consider using an antibacterial medication if necessary.

Prevent disease in Pygmy Corydoras by maintaining excellent water quality, avoiding overfeeding, and providing a balanced diet. Quarantine new fish before adding them to the main tank and treat any signs of illness immediately.


Breeding Pygmy Corydoras can be a rewarding experience for dedicated hobbyists. Follow these steps to breed Pygmy Corydoras:

  • Step 1:Create a suitable growing environment with a separate 5-10 gallon culture tank, pH about 6.5 to 7.0 and temperature about 24°C. Provide soft water (2-10 dGH) and add hiding places such as plants and spawning mops for fish comfort.
  • Step 2:Select healthy, mature male and female Pygmy Corydoras for breeding. You can determine the gender by observing their physical characteristics and behavior.
  • Step 3:Prepare the breeding pair with a high-protein diet of live or frozen foods for several weeks to help them gain strength and energy.
  • Step 4:Encourage spawning by introducing the pair to the breeding tank, gradually increasing the water temperature and reducing the lighting. Add a spawning mop or leafy plants for egg deposition.
  • Step #5:Take care of the eggs and fry by removing the breeding pair after spawning. Place the breeding tank in a dimly lit area, as eggs and hatchlings are sensitive to light. The eggs hatch in 3-4 days and the fry will be free swimming after a few days. Gradually increase the lighting time as the brood grows. Feed them first with infusoria or liquid fry food, then gradually introduce ground flake food.
  • Step #6:Monitor brood growth and development and separate them by size if necessary to prevent larger brood from preying on smaller ones. Growing Pygmy Corydoras can be a rewarding experience for experienced hobbyists. Patience and the right conditions are the key to success.

Recommended tankmates

Here are the top 10 recommended companions for Pygmy Corydoras:

  1. Dwarf Rashboras
  2. Neon Tetra's
  3. Heavenly Pearl Danios
  4. Endler's Living End
  5. Bristlenose plecos
  6. Cardinal Tetras
  7. Amano shrimps
  8. Nerites snails
  9. Harlequin Rashboras
  10. Otocinclus catfish

It is essential to avoid large, aggressive fish such as cichlids, angelfish and predatory species as they can harm or eat Pygmy Corydoras. Observe the behavior of the new fish and make sure they are not causing stress or aggression towards the Pygmy Corydoras.

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In summary, Pygmy Corydoras are an attractive species of freshwater fish known for their small size, peaceful nature, and easy care. These fish require specific water parameters, a balanced diet and a suitable environment to thrive in captivity. However, under the right conditions, they can live up to 3-4 years and make a fantastic addition to any aquarium. When choosing mates, it is important to choose peaceful and non-aggressive species to ensure a harmonious community. Growing Pygmy Corydoras can be a rewarding experience for experienced hobbyists, and patience and ideal conditions are the keys to success. Overall, Pygmy Corydoras are a pleasant and friendly species that can enhance any aquatic display with their charming appearance and peaceful demeanor.

Frequent questions

What is the ideal tank size for Pygmy Corydoras?

A tank of at least 10 gallons is recommended for a small group of Pygmy Corydoras. Choosing a larger tank is even better as it helps maintain stable water conditions and provides plenty of room for your fish to swim and explore.

How many Pygmy Corydoras should be kept together?

Pygmy Corydoras are schooling fish, meaning they thrive in groups of at least 6-8 individuals. Keeping a larger group helps your fish feel more secure and encourages them to display their fascinating natural behaviors.

What Water Parameters Do Pygmy Corydoras Need?

Pygmy Corydoras thrive in water temperatures between 72°F and 79°F (22°C and 26°C), pH between 6.0 and 7.5, and soft to moderately hard water with a hardness between 2 and 12 dGH.

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What do Pygmy Corydoras eat?

Pygmy Corydoras are omnivores and need a varied diet. Feed them a mixture of high-quality pellets or wafers, along with live or frozen foods such as water fleas, brine shrimp and bloodworms.

Are Pygmy Corydoras compatible with other fish?

Yes, Pygmy Corydoras are generally peaceful and can coexist with other non-aggressive fish species of a similar size. Ideal companions are small tetras, rasboras and peaceful shrimp species.

How Long Do Pygmy Corydoras Live?

With proper care and optimal tank conditions, Pygmy Corydoras can live 3 to 4 years.

How do I raise Pygmy Corydoras?

Growing Pygmy Corydoras can be a rewarding experience for experienced hobbyists. Use a separate breeding tank, prepare the breeding pair with a high protein diet and provide suitable water conditions and hiding places for spawning.

Do Pygmy Corydoras need a planted aquarium?

Although not absolutely necessary, a planted aquarium is highly recommended for Pygmy Corydoras. Live plants provide hiding places, improve water quality and create a more natural environment that closely resembles their native habitat.

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Can Pygmy Corydoras change color?

Indeed, Pygmy Corydoras can undergo color changes due to various factors such as stress, disease or changes in water conditions. If you see your Pygmy Corydoras exhibiting color loss, it is important to examine the water parameters and closely monitor their health.


Care, Size, Lifespan, Tank Mates and more!? ›

The longest lived of all the popular freshwater fish is the goldfish. If provided proper feeding and a clean, healthy environment, these fish can live up to 15 years. The oldest reported goldfish actually lived into his 30s.

Which fish has more life in aquarium? ›

The longest lived of all the popular freshwater fish is the goldfish. If provided proper feeding and a clean, healthy environment, these fish can live up to 15 years. The oldest reported goldfish actually lived into his 30s.

What size tank is easiest to maintain? ›

10-gallons is a good starting point, but 20-gallons (and beyond) would be the ideal tank for a beginner, budget permitting.

Can a pleco live in a 55 gallon tank? ›

These fish stay relatively small but can still keep a 55 gallon tank free of surface algae, in my experience.

How many zebra danios can you have in a 5 gallon tank? ›

In general, a 5 gallon fish tank will be big enough for 6 to 7 danios, although a 10 gallon tank is ideal. Alternatively, you can keep three or four small zebrafish in a 5 gallon tank.

What is the most loving fish? ›

The Friendliest Fish

Batfish are very curious and typically inquisitive with divers. Popular dive sites such as wrecks are often known for resident fish. These residents will follow divers around during their dive and often play in the exhaust bubbles.

What is the hardest fish to keep alive? ›

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  • Group of Clown Loaches, most not yet full grown.
  • Plecostomus. ...
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Apr 1, 2023

Is there a fish tank that cleans itself? ›

The EcoQube self-cleaning aquarium is the perfect choice for you if you're looking for an aquarium that requires minimal maintenance. The aquarium is designed for a betta fish and makes a beautiful and novel decorative piece for your office or home. The aquarium is marketed as the lowest maintenance tank of all time!

What are the most low maintenance fish? ›

Some of the easiest fish to take care of include white cloud minnows, cherry barbs, goldfish, guppies, neon tetras, and cory catfish. All of these species are relatively peaceful, non-demanding fish that do well in a beginning fish tank.

How many fish can I put in a 10 gallon tank? ›

Going by the numbers, however, you can put up to 8 to 10 fish in a 10-gallon aquarium tank. However, we would not recommend adding 10 fish in a tank unless the fish are tiny and do not generate too much waste. On the other hand, if you have chosen fish types that grow over time, you should limit the number to 8 or 6.

Can 2 different species of pleco live together? ›

In many cases, it's fine to keep several different plecos in the same tank. However, there can be problems. Keeping a fish that is quite shy with one that is very outgoing and greedy (e.g. common bristlenose) can lead to the shy fish not getting sufficient food.

Do plecos like heavily planted tanks? ›

The tank should be densely planted, especially with broad-leafed species like Java Fern and Anubias, to ensure that the pleco can feed on algae growing on the surface of the leaves. You should also provide your pleco with rock formations, overturned flower pots, and other hiding spaces in the tank.

Can plecos live in 70 degree water? ›

Most plecos are tolerant of waters ranging from 65 to 85 degrees Fahrenheit (18-30°C), though they prefer temperatures between about 75 and 82°F (24-28°C).

How many fish is too many for a 5 gallon tank? ›

You can keep about 2-4 fish in a tank this size as long as each fish is not larger than 1 inch. The one-inch fish per gallon rule would apply to most smaller fish breeds like Tetras, Betta, Rasbora, Shrimps, and more. Fish that can grow larger than 1 inch is not recommended for a 5-gallon tank.

How many GloFish tetras can you have in a 5 gallon tank? ›

We recommend keeping just one Tetra per gallon of tank space.

How many glow danios can you put in a 10 gallon tank? ›

Because they are relatively small fish, you can safely add two Danios per gallon of tank space.

What fish can bond with humans? ›

Angelfish are a particularly bright species of fish that will learn to recognize their owner and will readily eat out of a person's hand. Angelfish will often form lifelong connections with another angelfish and the two will stay with each other every second of every day.

What fish is most like a dog? ›

The dogface pufferfish is easily the fish that looks the most like a dog in any body of water in the world. After all, it's called a dogface pufferfish for a reason.

What fish is impossible to catch? ›

Tuna. Tuna are notoriously difficult to catch. These fish can survive in cold water and can dive to depths from 500 feet to 1000 feet. Troll for tuna between 4.5 knots and 7.5 knots.

What's the hardiest aquarium fish? ›

Zebra danios, Danio rerio, are just about the hardiest tropical fish you'll ever keep. They don't mind if the water is hard or soft, still or flowing, warm or unheated, and they are the single best fish for new fishkeepers and new aquariums.

What is the rarest fish to ever live? ›

1. The Devils Hole Pupfish is the Rarest Fish in the World.

How do I keep my fish tank clean without changing water? ›

Vacuum the Gravel Fish feces, shed scales, uneaten food, dead bits of plants, and other debris will settle to the bottom of your tank. Vacuuming the gravel every week will remove much of this debris and refresh the tank, brightening the gravel and keeping the tank healthier.

What is the white stuff floating in my fish tank after cleaning? ›

Hard water is the preferred habitat for certain fish species; unfortunately, it isn't so great for the clean, transparent glass of our fish tanks. If you've ever noticed a white residue forming on the top of your glass in a freshwater aquarium, you're probably seeing the result of the evaporation of hard water.

What is the most lazy fish? ›

Given that many shark species need to keep swimming to breathe, you wouldn't think them lazy, but the nurse shark is a different matter. They don't migrate like many species and spend most of their time lying motionless on the seabed, an activity made possible by the fact they can actively pump water over their gills.

What fish don't need a lot of space? ›

Answer: Betta fish are the only fish even remotely appropriate for a one-gallon tank. Because they are anabantids they can breathe air from the surface, and they can survive in less-than-ideal conditions. Small, one-gallon tanks often have poor filtration, and they pollute quickly, meaning most fish will perish.

What fish don't need a filter or heater? ›

Just looking at the list above, we can find goldfish, guppies, Zebra danios, paradise fish, and Japanese rice fish, all as suitable options for an aquarium without a heater. Java fern, Java moss, various Anubias, and moss balls are all good plants for an unheated tank too.

How long should I wait before adding fish to my tank? ›

You're going to be excited and anxious to fill your new aquarium with fish. Be patient! Let your aquarium "settle" for at least 48 hours before buying your first fish. This will give you time to make sure the temperature is set and make adjustments to decorations, etc.

How many fish should you introduce to a new tank? ›

In most cases, only two or three fish should be introduced to a tank initially. Once the nitrogen cycle is established and the tank is stable, additional fish can be added each week. However, the same rule applies when adding the next round of fish. Moderation: you must add only a few at a time.

What fish Cannot live with plecos? ›

Fish like Discus, Gouramis, and Goldfish should not be kept with larger Plecostomus.

How many pleco fish should I have? ›

How many plecos can I have in my tank? You should only keep one plecostomus per tank. This is because they can be territorial, especially as they age, and having more than one can lead to aggression. By keeping only one pleco, you are also ensuring that there is enough food to go around.

Can you mix plecos and catfish? ›

Cory catfish and plecos can live together as tank mates, because they are both peaceful fish. A tank size of minimum 20 gallons is needed. Certain species of pleco catfish need a bigger tank and will need a more plant-based diet, as opposed to cory catfish.

Why would pleco jump out of tank? ›

The most common reason why plecos jump is poor water quality, caused by a nitrite spike, ammonia spike, nitrate spike, or overstocking. Other reasons are stress, fights and tank size.

Do plecos really clean your tank? ›

Keeping an aquarium looking clean and free of algae is most often an ongoing battle. You may even have searched for fish that clean the tank. In freshwater aquariums, “Plecos” (short for plecostomus and used to refer to fish of the family Loricariidae) are one of the most common fish purchased to aid in algae cleanup.

Do plecos eat algae off gravel? ›

These freshwater catfish are known to be algae eaters, bottom feeders, and scavengers that will eat just about anything, making them a helpful addition to an aquarium. Originating in Central and South America, there are countless kinds of Plecos/catfish.

How hot is too hot for plecos? ›

However, there is a range in which most pleco species can live. The best water temperature for most pleco types is between 72°F and 76°F (22-26°C). Because they originate from the Amazon rainforest, they need warm temperatures Certain species like zebra plecos prefer higher temperatures 82°F between 88°F (28-31°C).

Can I release my pleco into the wild? ›

Also, do not release your common pleco into the wild because they are a highly invasive species and can do a lot of damage to the environment. Thankfully, there are much smaller plecos that are better suited for the average home aquarium.

Do plecos need a heater? ›

Yes, all plecos need a heater in their tank. Because they originate from the Amazon tropics, the water will need to be permanently heated to mimic their natural environment and maintain their body temperature/metabolism. The best temperature for plecos is between 72°F and 76°F, for most pleco species.

Can you overfeed fish in a tank? ›

In case you were wondering: yes, you can absolutely overfeed a fish. In fact, it's easier than you'd think! For starters, some fish food containers state to feed your fish as much as they can eat in as many as 10 minutes. That's way, way too much.

How many fish can you put in a 100 gallon tank? ›

One of the most important factors that comes into keeping fish in tanks or ponds is how many fish you can get away with keeping in one system. The tried and true rule of how many fish per gallon is: 1″ of fish per gallon of water.

How much fish can I put in a 50 gallon tank? ›

One Inch Per Gallon

The most widely known rule for stocking a tank is the one inch of fish per one or two gallons of water rule.

What is the lifespan of a GloFish? ›

What is the lifespan of a GloFish? It depends on the species, but on average, these fish live approximately 3-5 years. Betta fish tend to have a short lifespan closer to 2-3 years, whereas some hobbyists have reported owning rainbow sharks up to 13 years.

Can you mix GloFish and tetra? ›

GloFish Sharks can be semi-aggressive, so we advise keeping only one shark per aquarium. They can, however be housed along with other GloFish Tetras, Danios, and Barbs. It should also be noted that our GloFish Barbs can potentially become aggressive if they are not kept in groups of five or more.

Can tetras live with bettas in a 5 gallon tank? ›

We don't recommend putting neon tetras and bettas together if your tank is 5 gallons in size. This area will be much too small for both species to live together in harmony. The minimum tank size you should opt for when keeping these two fish together is 20 gallons.

How many black neon tetras can you put in a 10 gallon tank? ›

The neon tetra is some of the most striking and popular tropical freshwater aquarium fish. As a general rule, you can keep 6 or 7 of them in a 10-gallon fish tank. Keeping any more than this is known as 'overcrowding' and is full of potential problems.

How many Cory catfish can you have in a 10 gallon tank? ›

Nevertheless, most hobbyists agree that you can keep anywhere from 2 to 6 cory catfish in a 10-gallon tank, especially if you choose pygmy or dwarf varieties. As a general rule, the bigger your fish, the more space they need.

How many mollies and tetras can you have in a 10 gallon tank? ›

As a general rule of thumb, you can expect to keep about 1 inch of fish per gallon of water. So, if you have 3-inch mollies, you can probably only keep 3 of them in a 10-gallon tank. If you have only a couple of inches of mollies, you can probably keep 4 of them in a 10-gallon tank.

What are the easiest fish to keep alive in a fish tank? ›

Some of the easiest fish to take care of include white cloud minnows, cherry barbs, goldfish, guppies, neon tetras, and cory catfish. All of these species are relatively peaceful, non-demanding fish that do well in a beginning fish tank.

Which fish is not dying? ›

Common goldfish. Betta (Siamese fighting fish) Plecostomus.

Which is the most active fish? ›

Danios are generally very active and fun to watch. In terms of their diet, they will be more than happy with fish flakes. What is this? Our favorite Danios to keep are the Zebra Danio and the Giant Danio.

What is the oldest living fish in a tank? ›

Meet Methuselah, thought to be world's oldest living aquarium fish. SAN FRANCISCO — Meet Methuselah, the fish that likes to eat fresh figs, get belly rubs and is believed to be the oldest living aquarium fish in the world. In the Bible, Methuselah was Noah's grandfather and was said to have lived to be 969 years old.

What fish requires the least maintenance? ›

These creatures tend to have low maintenance needs and are relatively easy to take care of. In particular, guppies, zebrafish, goldfish, mollies, neon tetras, betta fish, and suckerfish are just some of the easiest fish to take care of in a community aquarium.

What types of fish Cannot live together in an aquarium? ›

Cichlids, certain species of sharks, loaches, knife fish, mormyrids and other territorial fish do not share space well with members of their own kind or closely related species.

What is the number one cause of fish death? ›

The most common cause of fish kills is suffocation due to lack of dissolved oxygen. Most dissolved oxygen is produced by algae and aquatic plants through photosynthesis. A lesser but also important source of oxygen in water is diffusion from the atmosphere, which is enhanced by wind-induced surface water turbulence.

What kills the most fish? ›

A low dissolved oxygen level is the most common cause of fish kills in ponds. Oxygen depletion can be caused by one or more factors during the summer, but water temperature is the most significant.

What fish has the most attacks? ›

Great White Shark

No list of deadly fish would be complete without the great white shark. Great white sharks are the most notorious sharks and are responsible for the highest number of unprovoked attacks on record.

What is the most sold fish? ›

By value salmon is the largest single fish commodity in the world and by volume or weight it is tuna. Regionally, in the European Union, tuna, cod, salmon, Alaska pollock and shrimps account for around 44% of the total volume consumed.

What is the #1 fastest fish? ›

Most sources believe that the fastest species of fish is the Indo-Pacific Sailfish, Istiophorus platypterus. According to Johnson and Gill (see below) the species has been clocked in excess of 110 km/h (68 mph) over short periods. The Indo-Pacific Sailfish grows to over 3.4 m in total length and 100 kg in weight.

What is the shortest aquarium fish lifespan? ›

The Sign Eviota, Eviota sigillata, a tiny coral reef fish, completes its entire life cycle within an eight week period. This species has the shortest lifespan of any vertebrate. In their 2005 paper Martial Depczynski and David Bellwood describe the Sign Eviota's remarkable life cycle.

What fish have a 2 year lifespan? ›

Killifish are among the aquarium fish with the shortest lifespan. They generally only live for a bit more than two years.

What aquarium fish are born alive? ›

Livebearing fish are some of the most popular tropical aquarium fish of all time and include guppies, platies, mollies and swordtails. They are so-called because the females give birth to live young, instead of laying eggs like other freshwater fish species.


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