| Temperature | 22–26 °C (72–79 °F) |
|---|---|
| pH | 6.0–7.8 |
| KH | 2–12 dKH |
| GH | 2–15 dGH |
| Min tank | 20 gal (76 L) |
| Adult size | 5 cm |
| Lifespan | 5–8 years |
| Diet | Omnivore |
| Temperament | Peaceful, schooling |
| Origin | South America (Peru, Ecuador) |
| School size | 6+ |
| Good tank mates | neon tetra, harlequin rasbora, guppy, cherry shrimp |
| Avoid with | large cichlid, aggressive fish |
Corydoras catfish are the smiling, whisker-faced bottom dwellers that every community tank benefits from. Species like the panda cory (Corydoras panda) and bronze cory stay small, mind their own business, and constantly sift the substrate for morsels.
Why keep corydoras
They are peaceful, hardy, and endlessly entertaining as they dart up to gulp air then settle back down. They also tidy up food that falls past other fish, though they are not a substitute for gravel cleaning.
Substrate matters
This is the one non-negotiable: corydoras need sand or very fine gravel. Their sensitive barbels get shredded on sharp coarse gravel, leading to infection and starvation. A 1–2 cm sand bed is ideal.
Heads up
Never use sharp, chunky gravel with corydoras. Damaged barbels quickly become infected, and a cory that cannot smell its food will slowly starve even in a well-fed tank.
Tank size and water
A 20-gallon tank suits a small school. They prefer 22–26 °C and tolerate a wide pH. Like most soft-water fish, they dislike ammonia and nitrite, so only add them to a cycled tank.
Diet
They are omnivores that need more than flakes. Sinking pellets, algae wafers, and the occasional frozen bloodworm or daphnia keep them rounded. Drop food after lights out so they get their share.
Tank mates
Ideal companions are other peaceful species: neon tetras, harlequin rasboras, guppies, and shrimp. Avoid large or aggressive fish that would see a cory as a snack.
How to recognise a healthy Corydoras Catfish
Before you buy, watch the tank at the shop for ten minutes. A healthy Corydoras Catfish (Corydoras panda) is alert and upright, holds its colour, and eats readily. Fins should be intact and unclamped, the belly lightly rounded rather than hollow, and the skin free of white speckling, cottony patches or red streaks. Avoid any fish that sits at the bottom, rubs against decor, or hangs at the surface gasping — those are early signs you may meet common fish diseases soon after purchase.
Tank setup that suits Corydoras Catfish
In the wild this fish comes from South America (Peru, Ecuador). Mirror that at home with a 20-gallon-or-larger tank, a soft sand or fine-gravel substrate, and plenty of live plants or driftwood for cover and territory. Stable warmth around 22–26 °C (72–79 °F) and a gentle but effective filter keep stress low. Keep them in a group of at least 6 so the shoal behaves naturally and no single fish is picked on.
Water parameters
Target 22–26 °C (72–79 °F) and a pH near 6.0–7.8. The single most important rule is stability: a cycled tank with ammonia and nitrite at zero matters more than hitting an exact number. Test weekly, and do regular partial water changes to keep nitrates under control.
Feeding Corydoras Catfish
They are omnivore by nature, so offer a varied diet: a quality dry staple plus frozen or live foods a few times a week. Feed only what they clear in about a minute, once or twice daily for adults. Overfeeding is the fastest route to poor water quality and ammonia spikes, so when in doubt, feed a little less.
Tank mates
Good companions for Corydoras Catfish include neon tetra, harlequin rasbora, guppy, cherry shrimp. Avoid housing them with large cichlid, aggressive fish. Always match tank mates by temperament and adult size, not just by how they look in the shop.
Common problems to watch for
Even well-kept Corydoras Catfish can run into trouble. The most frequent issues are parasitic and bacterial infections, poor water quality, and stress from overcrowding. Quarantine new arrivals in a separate quarantine tank for two to four weeks before they join the main display.
A simple weekly routine
Keep Corydoras Catfish thriving with a repeatable habit: test water weekly, top up with matched-temperature water during a partial change, wipe algae from the glass, and glance at the filter flow. A calm, consistent routine prevents most problems before they start.
How to recognise a healthy Corydoras Catfish
Before you buy, watch the tank at the shop for ten minutes. A healthy Corydoras Catfish (Corydoras panda) is alert and upright, holds its colour, and eats readily the moment food hits the water. Fins should be intact and unclamped, the belly lightly rounded rather than hollow, and the skin free of white speckling, cottony patches or red streaks. Eyes should be clear, not clouded. Avoid any fish that sits on the bottom, rubs against decor, or hangs at the surface gasping — those are early signs you may meet common fish diseases soon after purchase. Buying healthy stock is cheaper than any medicine.
Tank setup that suits Corydoras Catfish
In the wild this fish comes from South America (Peru, Ecuador). Mirror that at home with a 20-gallon-or-larger tank, a soft sand or fine-gravel substrate, and plenty of live plants or driftwood for cover and territory. Stable warmth around 22–26 °C (72–79 °F) and a gentle but effective filter keep stress low, and stress is the root cause of most illness. Keep them in a group of at least 6 so the shoal behaves naturally and no single fish is singled out or picked on. Good planting also gives shy fish somewhere to retreat, which pays off in calmer, healthier behaviour.
Water parameters
Target 22–26 °C (72–79 °F) and a pH near 6.0–7.8. The single most important rule is stability: a fully cycled tank with ammonia and nitrite at zero matters more than hitting an exact number on the dot. Test weekly and act on trends, not single readings. Carry out regular partial water changes to keep nitrates under control, and match the temperature of any new water to the tank so you never shock the fish. A simple log of dates and readings takes two minutes and turns vague worry into clear pattern recognition.
Feeding Corydoras Catfish
They are omnivore by nature, so offer a varied diet built on a quality dry staple with frozen or live foods a few times a week. Feed only what they clear in about a minute, once or twice daily for adults. Overfeeding is the fastest route to poor water quality and ammonia spikes, so when in doubt, feed a little less rather than a little more. Remove any uneaten food after a few minutes with a fine net or turkey baster. A varied diet keeps colours vivid and the immune system strong; a monotonous one leads to deficiency and faded fish over time.
Tank mates
Good companions for Corydoras Catfish include neon tetra, harlequin rasbora, guppy, cherry shrimp. Avoid housing them with large cichlid, aggressive fish. Always match tank mates by temperament and adult size, not just by how they look in the shop — a fish that fits the tank at two centimetres may outgrow every neighbour within a year. Add new tank mates to a settled, established tank rather than all at once, and observe for the first hour to catch any chasing early.
Common problems to watch for
Even well-kept Corydoras Catfish can run into trouble. The most frequent issues are parasitic and bacterial infections, poor water quality, and stress from overcrowding or bullying. Learn the early warning signs now: clamped fins, lost appetite, rapid breathing, flashing against decor, or a change in colour. Catching a problem in the first day or two is the difference between a quick recovery and a tank-wide outbreak. Quarantine new arrivals in a separate quarantine tank for two to four weeks before they join the main display.
Acclimating new Corydoras Catfish
When new fish arrive, float the sealed bag for 15–20 minutes to equalise temperature, then add a small cup of tank water every five minutes for half an hour so they adjust to your parameters gradually. Net them across rather than tipping shop water into your tank. Dim the lights and keep the room calm for the first evening; a gentle introduction prevents the shock that often precedes illness. Only feed the next day, once they have settled and are swimming normally.
A simple weekly routine
Keep Corydoras Catfish thriving with a repeatable habit: test water weekly, top up with matched-temperature water during a partial change, wipe algae from the glass, and glance at the filter flow. Watch feeding behaviour every day — a fish that skips a meal is telling you something. A calm, consistent routine prevents most problems before they start and makes the few that appear easy to spot and treat.
