Bronze Corydoras
Corydoras aeneus
Min Tank Size
75L
Adult Size
7.5 cm
Lifespan
10 years
School Size
6+
About
Bronze corydoras come from rivers and streams across South America, particularly the Orinoco and Amazon basins, where they spend their days nosing through sandy substrate in loose groups. They're one of the most recognizable fish in the hobby and for good reason. Compact, armored with two rows of bony scutes, and sporting a distinctive brassy-green sheen along their flanks, they're hard to mistake for anything else. Females tend to be noticeably wider-bodied than males, especially when viewed from above.
They do well in a wide range of water conditions, which is part of why they're such a reliable beginner fish. Aim for temperatures between 22 and 28 degrees Celsius and a pH anywhere from 6.0 to 7.8. Softer water is closer to their natural habitat, but they adapt readily to moderately hard water.
What they won't tolerate is poor water quality or sharp substrate. Barbel damage from coarse gravel is genuinely common and ruins their ability to forage properly, so fine sand is the right call. They're omnivores and will take sinking wafers, frozen bloodworm, daphnia, and quality pellets without complaint. Don't rely on them to clean up leftover food from other fish. Feed them directly with sinking foods at lights-out if your other tankmates are competitive eaters.
Keep them in groups of at least six and you'll see them at their best, socializing, zipping up to the surface for air, and working the substrate in a loose pack. Solo or pairs stay hidden and stressed. Bigger groups genuinely make them more active and confident. Real community tank builds featuring these fish are worth browsing if you're planning a South American biotope or a classic community setup.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Bronze Corydoras together
Bronze Corydoras are shoaling fish and need company of their own kind. Keep a group of at least 6. Smaller groups leave them stressed, washed-out in color, and prone to hiding.
Compatibility
Bronze corydoras work with almost anything that won't eat them. Classic pairings include tetras, rasboras, livebearers, gouramis, and danios. They occupy the bottom and leave the rest of the water column open, which makes them genuinely useful in a layered community setup. Avoid anything large and predatory like cichlids that can swallow them, or fish with a habit of harassing bottom-dwellers. With dwarf shrimp there's some risk, particularly toward juveniles or berried females during active foraging, though adult shrimp are usually left alone. Avoid any fish requiring very warm water above 28 degrees or strongly acidic conditions, as those don't align well with their preferred range.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The most common mistake is keeping them on coarse gravel. Barbel erosion sets in faster than most people expect and opens the door to bacterial infection. Fine sand is non-negotiable for long-term health. The second big issue is treating them as a cleanup crew and not feeding them directly. They need their own sinking food, every day. They're also more sensitive to ammonia and nitrite than their hardy reputation suggests, so skipping water changes catches up with you quickly. A well-maintained tank with good filtration and sand substrate produces corydoras that live well past ten years.
Behavior & Aggression
Bronze corydoras are about as non-aggressive as a fish can get. They don't establish or defend territories, won't harass tankmates, and show no interest in fin nipping. The only behavior that might look aggressive is males chasing females during spawning, which is vigorous but not harmful. In large groups they can be boisterous and fast-moving along the bottom, which might startle shyer bottom-dwellers, but that's a compatibility concern rather than aggression. No special steps are needed to manage their behavior.
Things to Know
- Barbels rot in sharp or coarse substrate, use sand or smooth gravel only
- Sensitive to ammonia spikes, pristine water quality is essential
- Do not keep fewer than 6, isolated individuals become stressed and inactive
- Albino variant has identical care needs and mixes well with bronze morphs
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