Sterbai Corydoras
Corydoras sterbai
Min Tank Size
75L
Adult Size
6.8 cm
Lifespan
10 years
School Size
6+
About
Native to the upper Rio Guapore basin on the Bolivia-Brazil border, Corydoras sterbai has earned a devoted following for good reason. The pattern is hard to ignore: a dark brownish-black body covered in small white spots that reverse into pale horizontal banding toward the head, with those unmistakable orange-tinted pectoral and ventral fins that almost glow under decent lighting. They stay compact at around 6.8 cm, making them practical for mid-size community setups without demanding huge tanks.
What really sets sterbai apart from most other corydoras is temperature tolerance. They handle warmth up to 30 degrees comfortably, which opens the door to tankmates like discus, German blue rams, and other soft-water tropical fish that cook most other cories. They prefer soft, slightly acidic to neutral water, though captive-bred individuals adapt to a wider pH range without much fuss.
Feeding them is straightforward. Sinking wafers, frozen bloodworms, daphnia, and quality pellets all go over well. They spend most of their day poking through substrate and scavenging whatever drifts down from above. Fine sand substrate is important, not optional. Gravel or coarse substrate slowly erodes their sensitive barbels, and once that damage sets in it can become a persistent problem.
Groups of six or more are the minimum for them to feel secure enough to be active and visible during the day. Fewer than that and you'll mostly see them hiding. They're genuinely one of the easier bottom dwellers to keep happy, with the bonus of being one of the prettiest.
Browse actual tank journals featuring sterbai to see how well they look against a dark substrate with midwater schoolers above them.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Sterbai Corydoras together
Sterbai 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
Sterbai shine in warm community tanks built around soft-water species. They're one of the few corydoras genuinely suitable with discus and rams given their temperature overlap. Peaceful midwater schoolers like rummy nose tetras, cardinal tetras, and ember tetras make excellent companions. Avoid anything large enough to swallow them, including many cichlids and larger predatory fish. They're generally fine with adult dwarf shrimp but smaller shrimp fry may occasionally disappear. Avoid aggressive bottom-dwellers that compete for the same space, like aggressive loaches or territorial plecos. A sandy substrate and calm tank environment brings out their best behavior.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The most common beginner mistake is keeping them on gravel. Barbel erosion follows quickly, leaving them vulnerable to bacterial infection. Fine sand is the right choice, full stop. Water quality matters more than people expect for a supposedly hardy fish. Elevated nitrates and stagnant bottom flow cause barbel problems even on sand. Make sure your filtration creates some gentle movement near the substrate. Sinking food is essential as they compete poorly for surface food. Feeding them at lights-out helps ensure they actually get nutrition rather than letting faster fish eat everything first.
Behavior & Aggression
Sterbai corydoras are about as non-aggressive as freshwater fish come. There's no territorial behavior, no fin nipping, no bullying of tank mates. The closest thing to aggression you'll see is males enthusiastically chasing females during spawning, which looks frantic but is entirely normal reproductive behavior. Even then, no fish gets hurt. They coexist peacefully with anything that won't fit them in its mouth, and they don't compete aggressively for food or space even with other bottom-dwellers.
Things to Know
- Sensitive to sharp substrate, use fine sand to protect barbels.
- Barbel erosion is often the first sign of poor water quality.
- May pick at very small shrimp fry opportunistically.
- Keep in groups of 6+, lone individuals become stressed and hide.
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