Corydoras

Corydoras key facts

Care level

Beginner-friendly

Lifespan

5-10 years

Size

3-8cm

Diet

Sinking tablets, frozen bloodworms

Tank

45cm+ recommended for schooling

Substrate

Fine, smooth sand ideal

Schooling

Keep 5+ together, same species best

Temperature

22-26°C

Notes

Many species sensitive to medications — use half dose

About Corydoras

Corydoras are a diverse group of small catfish native primarily to the Amazon River basin of South America, with over 160 known species that have been scientifically described since the 19th century, and new species continue to be discovered. Ranging from 3 to 8 centimeters depending on the species, they are distinguished by bony plates called scutes that cover their bodies in place of scales. Their two pairs of sensitive barbels around the mouth are used to sift through substrate in search of food, producing the endearing rooting behavior that makes them so beloved. Gentle and somewhat shy by nature, corydoras are social fish that live in groups, making multi-individual keeping essential for their wellbeing. They coexist peacefully with tetras and other small community fish, while also contributing to the tank ecosystem by cleaning up leftover food from the bottom. Hardy and relatively disease-resistant when kept in suitable conditions, they can live 5 to 10 years, earning devoted fans among both beginners and dedicated collectors alike.

7 things to know before welcoming a Corydoras

1. 1Keep Them in Groups

   Corydoras are social fish that thrive in groups; kept alone, they tend to hide and show signs of stress. Aim for a minimum of 3–6 individuals of the same or compatible species to see their natural, lively schooling behavior.

2. 2Choose Substrate Carefully

   Corydoras sift through substrate with their sensitive barbels to find food, so sharp-edged gravel can injure their mouths and whiskers. Fine-grained, smooth river sand or small rounded substrate is the safest choice to protect their barbels and support natural foraging behavior.

3. 3Stable, Soft Water Is Key

   Most Corydoras originate from South American river systems and prefer a pH of 6.0–7.5 with water temperatures of 22–26°C. They are sensitive to sudden water-parameter shifts, so limit water changes to about one-third of the tank volume at a time and always dechlorinate new water thoroughly.

4. 4Use Sinking Foods

   As bottom-dwellers, Corydoras rarely reach surface-floating flakes before other fish do. Provide sinking wafers or pellets as a staple diet, supplemented with frozen bloodworms or tubifex dropped directly to the substrate to ensure they get adequate nutrition.

5. 5Choose Tankmates Wisely

   Corydoras are peaceful and pose no threat to other fish, making them excellent community tank members alongside mid- and upper-level species. However, avoid housing them with large predatory fish or highly territorial species that may stress or harm them. Small, peaceful fish like tetras or rasboras are ideal companions.

Frequently asked questions about Corydoras

Q.Can I keep a single corydoras on its own?

A.While it is technically possible, corydoras are social fish that feel stressed without companions. Keeping at least three individuals of the same species is strongly recommended for their health and happiness.

Q.Are corydoras suitable for planted tanks?

A.Corydoras generally do well in planted tanks, especially when paired with fine soft sand that protects plant roots. However, their active bottom-dwelling behavior may occasionally dislodge plants with shallow or delicate root systems.

Useful tools for Corydoras care

Learn more about Corydoras in the encyclopedia

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