How Many Cory Catfish in a 20 Gallon Tank? (Must Read)

Are you considering adding Cory Catfish to your 20-gallon tank? While the species will bring character and charm to community tanks, it’s essential to consider how many attractive bottom feeders are too many for such a confined space. So, how many Cory catfish in a 20 Gallon Tank will survive healthy?

In this guide, we’ll look at what an aquarist needs to know about stocking their tank with popular Cory catfish—from suggested limits per gallon size to guidelines on selecting males and females from the same species grouping.

How many corys in a 20 gallon tank

This fish keepers comprehensive blog post will have all of your Cory Catfish questions answered!

Are Cory Catfish Schooling Fish?

Yes, Cory catfish are community fish. That is the way the family swims. It eats small insects like fish larvae and insects from the environment in which it is.

The animals are also seen in the same manner as herds rather than in schools and fight whenever necessary. They also use their barbels for food detection and can survive in freshwater.

What is the Ideal Number of Cory Catfish per Gallon?

The ideal number of Cory Catfish per gallon depends on the size and type of fish and the water conditions. Generally, however, it’s recommended to stick to one inch of fish per two gallons for a 20-gallon fish tank.

Cory catfish temperature

That means you can safely keep up to ten Cory Catfish in a 20-gallon tank. The amount should be calculated accordingly if the individuals are larger than an inch. Remember that overcrowding can cause problems and inhibit proper nutrition for the hardy fish.

How Many Cory Catfish in a 20 Gallon Tank?

How many corys in a 20 gallon tank? A 20-gallon tank can safely have more cory catfish and house between eight and 10 Cory Catfish. 

As with any aquarium, the number of specimens should be determined depending on the species’ size and activity level and the rate at which you will be doing regular water changes to maintain Cory catfish healthy water conditions.

When housing these fish in a group, providing them with more space is always better rather than crowding too many into a smaller aquarium. A large group enables them to display their natural schooling behavior, promoting harmony within the community. 

To determine an ideal species of Cory Catfish for your 20-gallon tank, consider four inches (10cm) of fish per 10 gallons (38L). This allows each individual enough swimming space while maintaining good water quality throughout the long tank.

For this particular example, 8-10 is sufficient, depending on other residents in your system.

4 Factors that Determine How Many Cory catfish can be kept in a 20-gallon tank

How many catfish are in a 20 gallon tank? Numerous factors affect how long Cory catfish can stay in 20-gallon tanks. Tell me the difference between the number and quantity of Cory catfish in the species-appropriate tank in the aquarium.

Size of the Cory catfish:

The size of Cory catfish directly affects the number of fish in your aquarium. Smaller Cory Catfish require more space than larger ones, meaning a 20-gallon tank can comfortably house fewer.


It’s important to note that tankmates can also affect how many Cory Catfish you can keep in your 20-gallon aquarium. If you plan to house Cory Catfish with other fish species, it’s essential to factor in the combined space requirements when determining how many fish can be safely kept.

The temperature of the tank water

Temperatures on the water in 20-gallon tanks are essential to determine the amount of coral catfish in the tank. If temperatures suit Cory catfish, you can limit your numbers to one per fish.

Species of Cory catfish that you will keep

There are several species of coral catfish worldwide. It is mainly determined by species how many Cory catfish can be kept. Each species has different ranges on what can be kept in 20 gallons tanks. So coral catfish are very important.

Should Cory Catfish Be Kept in Groups of One Species?

Keeping groups of one species is recommended when it comes to Corydoras Catfish, as this will help avoid territorial disputes and other issues that can arise with mixed-species aquariums.

If you are keeping multiple species of Cory Catfish, provide adequate space and hiding places for them. Also, keep the same number of males and females, reducing the likelihood of aggression.

What Is the Best Cory for a 20-gallon Tank?

Panda Cory catfish

When selecting the best Cory for a 20-gallon tank, one of the foremost considerations should be Panda Corydoras (Corydoras panda). This species is hardy and adaptable to a wide range of water conditions.

As freshwater fish, they require an aquarium with neutral to slightly acidic pH levels, temperatures between 72-78°F (22-26°C), and moderate hardness. Six pandas can be kept at a tank capacity of 20 gallons. It’s the perfect aquarium hobby pandas, Cory catfish for keeping.

These bottom-dwellers are peaceful fish and relatively easy to care for, often hiding during the day but coming out to feed during dusk or dawn. They prefer being in shoals of at least three individuals but can thrive with larger groups of up to 8 – 10.

In addition, these fish benefit from having plenty of hiding places to feel safe throughout their environment, such as clay flower pots, driftwood pieces, or plants like Java Ferns or other low-light plants.

The Panda Corys are omnivorous feeders and will accept most sinking foods, including small flakes and pellets explicitly formulated for Corys, frozen foods like brine shrimp and bloodworms, and live food options like micro worms or daphnia.

It’s important that these fish remain well-fed since underfed specimens may become bullish towards others in its school; therefore, regular feeding intervals should be established to maintain proper health amongst all tankmates, including any invertebrates present within the aquarium parameters. 

In conclusion, its mild temperament towards other classmates while requiring minimal maintenance once acclimated makes this attractive species an ideal fit into any tropical fishes community set up within a 20-gallon tank limitation!

Sterba’s Cory Catfish/ Sterbai Corydoras

Sterba’s Cory Catfish/ Starbei Corydoras Catfish/ Catfish storage is in a 20 gallon capacity. The maximum size of the fish tank is 5 stars corydoras due to its high weight. The ideal temperature for the tank is 72-78 degrees Fahrenheit with a pH level of 6.0 to 8.0, and the water should be soft to slightly hard.

Pygmy Cory catfish

Pygmy Cory catfish can be kept in 20-gallon tanks with a minimum tank size of 10 gallons. In these different pygmy corys, the catfish species is a small schooling fish and should be kept in groups of 5 or more.

They will do best when the fish tank’s temperature is maintained between 72-78 °F (22-26 °C), and the pH is between 6.0 – 8.0, with a water hardness of 5-19 dGH.

Pygmy Cory catfish are omnivorous, so they will accept various food, such as flakes and pellets formulated for Corydoras, and live and frozen food like brine shrimp, bloodworms, tubifex worms, etc.

How Many Cory Catfish Should You Keep Together?

The general rule of thumb for keeping Cory Catfish is 6 individuals in a group. This number allows them to stay active and healthy as they naturally travel in small shoals in their native habitats.

Allowing this behavior fish to thrive in your aquarium helps keep aggression levels at bay while avoiding overcrowding. To ensure the best outcome, it’s essential to choose tankmates that are compatible with the Corydoras, or else you could end up with stressed or even injured fish.

Can Corydora fish Live Alone In A 20 Gallon Tank?

Can you have one Cory catfish in a 20-gallon tank? Cory catfish are friendly creatures that enjoy the safety in several different environments.

However, there’s an option to keep up to 3 different kinds of catfish together, though you might want to keep one. The rest are timider. The resulting ills are likely to have more extended life periods.

Can You Put Different Cory Catfish Together?

Yes, if their habitats are compatible, you may mix different Cory catfish in an aquarium. If there are similar markings on them, they should have an exact color and be compatible.

A giant Cory catfish could not match a smaller cory catfish species. It must also be separated. Before adding any Cory catfish to an aquarium, research the species and ensure the size, temperament, and water parameters match correctly.

How many Panda Corys are in a 20-gallon?

A minimum of six Panda – Corys can reach 20 liters. It’s been observed that Cory catfish live as a pack in school. They are usually in a group. The smaller tanks can also remain active all day based on the environment.

According to Panda Cory dimensions, you can store up to 6 Panda-Corys in 20-gallon tanks. Experts have advised keeping half a dozen Cory catfish in the larger tank too. Therefore it is possible to keep five Pandas per tank.

How Many Gallons Does 1 Cory Catfish Need?

Each Cory catfish should have between 2 to 4 gallons of water. The size and number of your fish and their activity level will determine precisely how much space they need to live comfortably.

For example, a single Cory Catfish does best in a 2-5 gallon tank with plenty of hiding spaces near the ground or on the sides. If you are keeping multiple fish together, consider adding about 1 extra gallon per additional fish.

Additionally, for every inch (2 cm) of fish length, there should be at least one gallon (4 liters) of water to allow ample swimming space and reduce waste buildup from overcrowding.

Can I Have Just 2 Corydoras?

Yes, you can have just 2 Corydoras in an aquarium. You should ensure that the tank is adequately sized (at least 10 gallons) and that the water parameters (temperature, pH, hardness, etc.) suit these different Cory catfish species.

The two Corydoras should be of the same species and closely matched in size for the best results. It’s also essential to ensure plenty of hiding places, floating plants, and other decorations in the tank to help reduce aggression levels.

How to Tell If a Cory Catfish Is Stressed

Also, be sure to provide a diet consisting of dry foods and live and meaty foods, like brine shrimp, bloodworms, tubifex worms, etc., to keep your Corydoras healthy and active.

Finally, if you decide to introduce more Corydoras into the tank, be sure to do so gradually and in small groups so that the existing fish can become accustomed to their new tankmates. This will reduce potential aggression and ensure a happy, healthy community of Corydoras.

How Many Gallons of Water for 3 Cory Catfish?

Three Cory Catfish need 10 gallons of water in their tank. Bottom-dwellers require plenty of space at the bottom to swim around and explore.

Generally speaking, you should have 1 gallon (3.7 liters) of water for every inch of fish, with 3 Cory Catfish needing at least a 10-gallon tank (37 liters).

Be sure to use a good filter and keep up on regular maintenance such as weekly 30-50% water changes to ensure that your corys stay healthy!

What Is the Best Size Tank for Cory Catfish?

Generally, we recommend a 20-gallon aquarium as adequate for 4-5 Cory Catfish. A 10-gallon aquarium may also suffice if the tank isn’t heavily stocked and there are plenty of hiding places for the fish.

However, remember that the more space available, your fish will be healthier and happier. With larger tanks, you can add more decorations without fear of overcrowding – so it’s always better to go bigger if possible!

What Tank Mates Can You Keep With Cory Catfish?

Cory catfish dwell on the sand and soft substrates, and adding similar-sized community tank partners at different levels makes sense.

Keep the length of your fish similar so that no big fish can attack your other Cory fish or catfish. Most moderately alkaline water tanks suit smaller Cory catfish or small fish.

Suitable tank mates for corys include neon tetras, some other small species of tetra, guppies, dwarf gouramis, dwarf Cory catfish, tiny barbs like the rosy barb and cherry barb, fancy guppies, german blue rams, small rasboras, livebearers like mollies and platies, and much other species that enjoy living in a community tank.

Research each species carefully before adding any new fish to your tank!

Final Thoughts

So, how many corydoras are in a 20 gallon tank? In conclusion, the number of Cory Catfish that can be safely kept in a 20 gallon tank depends on various factors. It is essential to consider the size, behavior, and dietary needs of the Cyprinid Catfish when determining how many to keep. If other fish are already in the tank, it is essential to keep an eye on their activity to ensure they have enough space and resources.

To maximize success and reduce stress to your bronze Cory Catfish, provide frequent water changes and pay close attention to their environment for signs of aggression or illness. When done correctly, keeping multiple Cory Catfish together can be extremely rewarding for hobbyists and fascinating for viewers alike. You can create a healthy home for your Cory Catfish community with care and proper monitoring!

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About Me

I am the founder of, a devoted wife and mother, and an avid fish enthusiast. My aim is to assist fellow fish lovers worldwide in understanding how to properly care for and breed their pet fish.

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