Corydoras sterbai
The heat-tolerant cory, the only one that genuinely thrives alongside discus and rams at 28 °C+. White spots on a dark body, orange pectoral spines. Soft sand substrate is essential.
Sterbai Corydoras (Corydoras sterbai) reaches 6–7 cm as an adult and needs a minimum tank of 75 L. Native to Rio Guaporé basin, Brazil & Bolivia, it lives in the bottom water column with a peaceful temperament. Aim for 24–30 °C, pH 6.0–7.5, and 3–15 dGH hardness. Lifespan is 5–10 years with good care. Keep sterbai corydoras in groups of 6+, yes schoolers need numbers to display natural behaviour. Diet: omnivore (sinking), Sinking pellets, catfish wafers, frozen bloodworms. Hugely enthusiastic eaters, feed enough. Plant-safe: Yes. Shrimp-safe: Yes (adult shrimp).
Care at a glance
The heat-tolerant cory, the only one that genuinely thrives alongside discus and rams at 28 °C+. White spots on a dark body, orange pectoral spines. Soft sand substrate is essential.
By Mike ElmiraUpdated 3 min read
Part of our complete guide to aquarium fish for the planted tank.
The parameters that decide whether sterbai corydoras fits in your tank.
Bottom
Yes
Group of 6+
Callichthyidae
Omnivore (sinking)
Sinking pellets, catfish wafers, frozen bloodworms. Hugely enthusiastic eaters, feed enough.
5–10 yrs
Medium
Shallow flooded forest of the Guaporé river basin
Rio Guaporé basin, Brazil & Bolivia
Tank-mate safety and the species this one is documented to thrive (or fail) alongside.
Discus (the classic pairing), German blue rams, angelfish (when small), cardinal tetras, rummynose tetras, plant-safe peaceful warm-water fish. They are perfect partners for fish that need 28+ °C tanks where other corys would struggle.
Aggressive cichlids that bully bottom-dwellers, oscar-sized predators, fin-nippers, anything that competes aggressively for substrate.
Hard-won lessons from the tank.
A school of 6+ sterbais grubbing in fine sand under the silhouette of a discus pair is the platonic ideal of a soft-water Amazon biotope. Drop food directly on the substrate after lights dim — they feed best when not competing with mid-water fish. Watch for the 'wink' — they flick their eyes downward, a behaviour unique to corydoras and unmistakable once you spot it.
Genus 'Corydoras' = 'helmet skin' (their bony body plates). Species 'sterbai' honours Czech ichthyologist Günther Sterba, author of the foundational Freshwater Fishes of the World.
What can go wrong and how to spot it.
Failure modes, in order of how dramatic the fix is.
Robust if water quality is good. Watch for barbel erosion on coarse substrate — soft fine sand is essential. Sensitive to copper and high nitrate; sensitive to soil-based active substrates lowering pH abruptly.
Often labelled 'good for heated discus tanks' as if heat is a tradeoff — actually 26–28 °C IS their preferred range, not a tolerance. Many keepers keep them too cool at 22–24 °C; they're more active and brighter at 27 °C.
The practical routine, read top to bottom.
75 L+ with FINE SAND substrate (gravel destroys barbels). Heavy planting, driftwood, leaf litter. Moderate flow — they like clean oxygenated water. Temperature 26–28 °C is the sweet spot; tolerates up to 30 °C unlike most corys.
3 weeks on soft sand. Observe barbels and fin condition — sterbai are sensitive to bad substrate even in QT.
Where it comes from, how it behaves, and the variants you'll see at retail.
Where it lived before it came home.
Rio Guaporé basin straddling Brazil and Bolivia. Warm, soft, slow-moving rivers with sandy substrate, leaf litter, and woody debris. Hotter than most cory habitats — daytime water often exceeds 28 °C in the dry season.
Insect larvae, micro-crustaceans, biofilm, detritus. Substrate-grubbing forager.
Not threatened. Captive-bred in large numbers, especially in Eastern Europe.
How they pair, reproduce, and grow.
Females larger and rounder when conditioned; males slimmer. Both sexes show the same pattern of white spots and orange pectoral spines.
Classic T-position cory spawning. Soft slightly acidic water, drop temperature 2–3 °C with a large cool water change to trigger spawning, return to 26 °C. Eggs adhered to glass, broad plant leaves, or spawning mops. Move eggs to a separate hatching container or remove parents. Fry need microworms and crushed flake.
The named cultivars and the lookalikes worth flagging.
Wild type plus an 'albino sterbai' (orange-bodied with red eyes) commercially produced. Less commonly, a 'high-fin' variant with elongated dorsal rays.
Direct answers to the questions search engines and AI assistants surface most often about this species.
Sterbai Corydoras (Corydoras sterbai) needs a minimum tank of 75 L. They live in the bottom water column and should be kept in groups of 6+, so a longer footprint matters more than depth.
Target 24–30 °C, pH 6.0–7.5, and 3–15 dGH hardness. Acclimate slowly when moving them between water sources.
Shrimp safety: Yes (adult shrimp). Plant safety: Yes.
Sterbai Corydoras are omnivore (sinking). Sinking pellets, catfish wafers, frozen bloodworms. Hugely enthusiastic eaters, feed enough.
On Fin & Stem's 1–5 difficulty scale this species rates 2/5. Forgiving, beginner-friendly once the tank is cycled. Breeding difficulty: medium.
Typical lifespan in a well-maintained tank is 5–10 years.
A planted tank is a system. Pair this fish with one entry from each other pillar to plan the whole scape.
