Sterba's Cory is one of the longest-living corydoras, capable of reaching 20 years. An ideal discus tankmate thanks to its tolerance of warm water.
Overview
Corydoras sterbai, commonly known as Sterba's Cory, is a small armored catfish from the family Callichthyidae and one of the most popular and recognizable members of the Corydoras genus in the aquarium hobby worldwide. In the wild, this species inhabits the Rio Guapore basin on the border of Brazil and Bolivia, where it lives in slow-flowing tributaries with soft sandy bottoms and abundant leaf litter.
Sterba's Cory grows to 6-7 cm and features a distinctive contrasting coloration: the body is covered with a scattering of white dots on a dark brown background, while the pectoral fins are colored a vivid orange — the hallmark of this species. The intensity of the orange hue directly depends on diet quality and keeping conditions: with proper care, the fins take on a rich, almost fiery color.
One of the most remarkable traits of Corydoras sterbai is its exceptional lifespan. With good care, these catfish live 15-20 years, making them one of the longest-living among all corydoras species. This is a true long-term companion, something worth considering before purchase.
Like other members of the genus, such as the panda cory, Adolfoi cory, and bronze cory, Corydoras sterbai is diurnal and spends most of its time near the bottom, sifting through the substrate in search of food with its sensitive barbels.
Tank Requirements
A group of Corydoras sterbai requires an aquarium of at least 80 liters. Optimal water parameters are: temperature 24-28°C, pH 6.0-7.8, and general hardness (GH) 5-15. A key feature of this species is its excellent tolerance of warm water up to 28°C, which sets it apart from most other corydoras and makes it an ideal companion for discus, which require exactly this temperature range.
Substrate is a critically important element in a corydoras tank. Use only fine rounded sand: coarse gravel or substrate with sharp edges damages the fish's delicate barbels, leading to infections and loss of the ability to find food.
The aquarium should be decorated with driftwood, rocks, and live plants that create hiding spots and shaded areas. Sterba's Corys appreciate subdued lighting and the presence of floating plants on the surface. Water flow should be moderate, and filtration must be efficient, as these catfish are sensitive to elevated levels of nitrates and ammonia.
Feeding and Diet
Corydoras sterbai is an omnivorous species that in the wild feeds on small invertebrates, insect larvae, and plant debris on the bottom of waterways. In the aquarium, the dietary foundation should consist of high-quality sinking granules and tablets designed for bottom-dwelling fish.
For a well-rounded diet, regularly supplement with live and frozen foods: bloodworms, tubifex, brine shrimp, and daphnia. It is precisely these protein-rich foods that enhance the orange coloration of the pectoral fins — the more varied and nutritious the diet, the brighter the fins become.
Feed the fish 1-2 times daily, ensuring that food reaches the bottom. Evening feeding is particularly important, as corydoras actively forage along the bottom during twilight hours. Avoid overfeeding — leftover food quickly pollutes the water and degrades its quality.
Care and Maintenance
The care difficulty for Corydoras sterbai is rated as low, making this species suitable for aquarists with minimal experience. The key requirement is stable water quality. Weekly water changes of 20-30% of the volume are mandatory to maintain low nitrate levels.
Sterba's Corys are schooling fish and must be kept in groups of 6 or more. In a school, they display natural behavior, becoming more confident and active. Solitary keeping leads to chronic stress and a shortened lifespan.
Regularly inspect the fish's barbels: shortening or inflammation is the first sign of problems with the substrate or water quality. When kept on sand with timely water changes, this issue generally does not arise.
Given that Corydoras sterbai can live up to 20 years, be prepared for long-term care. This is one of the longest-living small aquarium fish, and under stable conditions, they will bring you joy for many years.
Compatibility
Corydoras sterbai is an exceptionally peaceful species with an aggression rating of 1 out of 5. These catfish get along well with virtually any non-aggressive fish.
The best tankmates are, first and foremost, discus, for which Sterba's Cory is one of the ideal bottom-dwelling companions thanks to their shared preference for warm water (24-28°C). Small characins also make excellent companions: cardinal tetras, other tetras, and rasboras. Other peaceful catfish and shrimp make good company as well.
Avoid housing them with large or aggressive species such as cichlids (with the exception of discus and apistogrammas), which may eat or injure the corydoras. Do not add territorial bottom-dwelling fish that would compete for space on the substrate.
Keeping them with other corydoras species is perfectly acceptable — they often form mixed schools. However, for comfortable breeding, it is better to maintain a single-species group.
Breeding
Breeding Corydoras sterbai in the aquarium is of moderate difficulty (3 out of 5). For spawning, prepare a separate tank with soft water (GH 5-8) and a temperature of 24-26°C. Spawning substrate is not required — females often deposit eggs on the aquarium glass and broad-leafed plants.
The spawning trigger is a large water change (up to 50%) with cooler water, simulating the onset of the rainy season in the wild. A temperature drop of 2-3°C combined with generous feeding of live foods initiates spawning behavior.
The female lays 50 to 200 large adhesive eggs, attaching them to various surfaces. After spawning, the parents must be removed, as they may consume their own eggs. Adding methylene blue to the water is recommended to prevent fungal infections.
The eggs incubate for 3-5 days at 25°C. Newly hatched fry spend their first days consuming their yolk sacs, after which they can be fed baby brine shrimp, microworms, and finely crushed dry food. Fry growth is slow, but with good feeding and clean water, they develop steadily.