Sterbai Corydoras

The Sterbai Corydoras (Corydoras sterbai) is one of the most admired and widely kept species in the corydoras family, valued for its striking appearance and ability to tolerate warmer water temperatures than most of its relatives. It has a dark brownish-black body covered with a dense pattern of small white or cream spots, transitioning to a bold white-spotted head with a pale face. The pectoral fin spines are bright orange, providing a vivid color accent against the darker body. Originating from the rivers and streams of the Guaporé river drainage in Brazil and Bolivia, the Sterbai Corydoras inhabits slow-moving, shallow water over sandy or silty substrate with abundant leaf litter and dense vegetation. Water temperatures in its native range can be warmer than many other corydoras habitats, and the Sterbai's tolerance of temperatures up to 30°C makes it one of the few corydoras species compatible with discus aquariums, where very warm conditions are standard. Like all corydoras, the Sterbai is a highly social, bottom-dwelling schooling fish that sifts through the substrate with sensitive barbels in search of food particles. It periodically darts to the surface to take atmospheric air, which is a normal and essential behavior. In groups of six or more, Sterbai Corydoras exhibit fascinating social interactions, synchronized movements, and are constantly active on the aquarium floor.

Tank Setup: A minimum of 80 liters is recommended for a group of six. Fine sand substrate is essential to protect the delicate barbels from abrasion. Provide driftwood, smooth rocks, and broad-leaved plants such as Echinodorus and Anubias for shade and shelter. Open sandy areas for foraging activity should be included. The tank should be well-covered as this species can jump.

Water Parameters: Target pH 6.0–7.8, GH 2–15, KH 1–8, and temperature 24–30°C. The warm temperature tolerance is a distinguishing feature of this species. Good oxygenation is still required at higher temperatures. Perform 25–30% water changes weekly with temperature-matched water.

Filtration: A good hang-on or canister filter providing gentle to moderate flow. Protect filter intakes with a sponge prefilter. Maintain clean substrate by gently siphoning during water changes to prevent anaerobic pockets in the sand.

Feeding: Offer a variety of sinking foods: high-quality corydoras or catfish pellets, Repashy community gel food, frozen bloodworms, brine shrimp, Tubifex, and daphnia. Feed in the evening when the fish are most active and ensure food sinks to the bottom before other fish consume it.

Social Behavior: Keep in groups of at least 6. Highly social and best observed in groups of 8–12, where schooling behavior is most prominent. Compatible with all peaceful fish including discus, angelfish, tetras, and dwarf cichlids. Completely non-aggressive.

Breeding: Will spawn in captivity with appropriate conditioning. Use soft, slightly acidic water. A small water change with slightly cooler water can trigger spawning. Eggs are placed on plant leaves and glass; parents do not guard them.

Health: Barbel erosion is the primary concern; use fine sand substrate exclusively. Keep water clean and well-oxygenated at all times.