Corydoras Catfish Care: Tank Size, Diet, Tank Mates & Care
Corydoras catfish are small, peaceful bottom-dwellers that thrive in groups of 6 or more. To keep them healthy, provide a 20-gallon tank (or larger) with a soft sandy substrate, plenty of hiding spots, and stable water conditions. Feed a varied diet of sinking pellets, frozen bloodworms, and blanched vegetables. They are compatible with most peaceful community fish but avoid aggressive or large tank mates.
Tank Size and Setup
For a group of 6 corydoras, a 20-gallon long tank is ideal due to its larger footprint. A standard 20-gallon also works but ensure enough floor space. Corydoras are active bottom scavers, so more space reduces stress. Use a soft, fine sand substrate to protect their barbels (whiskers); sharp gravel can damage them. Add smooth rocks, driftwood, and broad-leaf plants to create shaded areas. Keep the water temperature between 72-78°F, pH 6.0-8.0, and hardness 2-25 dGH. Perform weekly 25% water changes to maintain good quality.
Diet and Feeding
Corydoras are omnivorous scavengers. Feed them high-quality sinking pellets or wafers (e.g., algae wafers or catfish pellets) once or twice daily. Supplement with frozen or live foods like bloodworms, brine shrimp, daphnia, and chopped blackworms. Blanched vegetables (zucchini, cucumber) can be offered occasionally. Remove uneaten food after a few hours to prevent water fouling. Feed in the evening when they’re more active. A varied diet ensures vibrant health and coloration.
Tank Mates and Social Behavior
Corydoras are shoaling fish that must be kept in groups of at least 6 of the same species. They are peaceful and do well with small to medium community fish such as tetras, rasboras, guppies, mollies, platies, dwarf cichlids (e.g., apistogramma), and small gouramis. Avoid aggressive or large fish (e.g., cichlids, oscars, arowanas) that may bully or eat them. Also avoid fin-nippers like tiger barbs. Ideal tank mates are those that occupy mid to top water levels, leaving the bottom for corydoras.
Common Health Issues and Care
Corydoras are generally hardy, but they can suffer from barbel erosion if kept on rough substrate, or from stress due to poor water quality. Signs of illness include clamped fins, red spotches, breathing heavily, or hiding more than usual. To prevent problems, maintain clean water, avoid sudden parameter changes, and quarantine new fish. If you suspect disease, consult a veterinarian or an aquatic specialist. Do not treat with medications containing copper or malachite green, as corydoras are sensitive. Overdosing can be fatal.
Breeding Corydoras
Breeding corydoras is achievable in a home aquarium. Condition a group of 6-8 with high-quality live foods. Perform a large water change with slightly cooler water to simulate rainy season triggers. They spawn on hard surfaces like glass, plant leaves, or spawning mops. Adults often eat their eggs, so remove the eggs to a separate tank with gentle airflow and methylene blue to prevent fungus. Eggs hatch in 3-5 days, and fry can be fed infusoria then micro worms.
Key Takeaway
Corydoras thrive in groups of 6+ in a 20-gallon tank with soft sand, stable water, and a varied diet. They are peaceful and make excellent community fish.
Key Takeaway
Provide a 20-gallon tank with soft sand, a group of 6+ corydoras, and a varied diet of sinking pellets and live foods for a healthy, happy community fish.