🐟 Corydoras Catfish

📊Overview

Corydoras are charming, peaceful bottom-dwelling catfish that shoal and constantly forage the substrate. They need a soft, smooth-grained bottom or their delicate barbels get worn down and infected.

⚡Ownership snapshot

🧭Temperament & needs

📈Compared with other Fish

🧠Personality & temperament

Corydoras are among the most peaceful and endearing fish in the hobby—busy, sociable bottom-dwellers that trundle across the substrate in a shoal, methodically sifting for food. They are completely non-aggressive, ignore other species entirely, and are happiest in a group of their own kind where they feel secure enough to forage and play in the open. You'll often catch them darting to the surface to gulp a quick breath of air, a charming quirk of the group.

📜Origin & background

Corydoras are a large genus of small armored catfish native to the streams, creeks, and shallow river margins of South America, from the Amazon basin down to Argentina. Hundreds of species exist, and popular aquarium types like the bronze, peppered, and albino cory have been captive-bred for generations.

🏃Exercise & enrichment

Corydoras get their activity from constant foraging, so the best enrichment is an open sandy area to sift plus caves, plants, and driftwood to explore. A group of six or more encourages natural shoaling behavior—you'll see them race around together and rest in a huddle, which a lone or paired cory rarely does.

✂️Grooming & hygiene

The fish need no grooming, but their substrate does: soft sand or smooth, rounded gravel is essential to protect their delicate barbels, since sharp gravel wears them down and invites infection. Keep the bottom clean with regular substrate vacuuming and 25% weekly water changes, because corydoras spend their whole lives nosing through it.

🍽️Diet & feeding

Corydoras are omnivorous scavengers but should never be left to survive on 'leftovers' alone—they need their own food that reaches the bottom, such as sinking pellets or wafers, plus occasional frozen bloodworms or brine shrimp. Feed once daily in the evening if possible, dropping enough that the shoal finds it before faster mid-water fish steal it all.

🏠Housing & environment

A group of small corydoras is comfortable in a 75 L (about 20 gallon) or larger tank with a footprint that gives plenty of floor area, since they live on the bottom. Essentials are a soft sand substrate, gentle filtration, hiding spots, live plants, and stable warm water (22–26°C) with good oxygenation.

🩺Health & lifespan

Corydoras are hardy but have two classic vulnerabilities: barbel erosion and infection from sharp or dirty substrate, and sensitivity to poor water quality and to salt or medications dosed for other fish. They are scaleless (armored, not scaled), so treat illness gently and at reduced doses. With clean water, soft sand, and a proper group, they commonly live 5–10 years, sometimes longer.

🎓Training & socialization

Corydoras can't be trained, but they quickly learn when and where food appears and will gather at feeding time. Acclimate them slowly with the drip method, as their scaleless bodies make them extra sensitive to sudden changes in water chemistry.

💰Cost of ownership

Corydoras are one of the more affordable fish to keep: the fish are inexpensive, and because they don't need a huge or tall tank, startup costs stay reasonable. Ongoing expenses are low—sinking food, water conditioner, and modest electricity—making them a budget-friendly, long-term community fish.

💚Who it's good for

Great for community keepers wanting an active, sociable bottom cleaner that stays peaceful.

💡Great match for

🔎People also ask