Fawn Cory

Geographic Origin and Biotope: Endemic to the Guaporé River basin in Brazil. Mainly frequents slow-flowing rivers and igapó, with very fine sand bottoms and dead leaf litter, clear or slightly amber waters.

Taxonomy and Morphology: Corydoras of the Callichthyidae family. Possesses a typical short snout, developed barbels, slightly slender but robust body, and measures about 5 cm (2 inches) as an adult. Features the classic skin armor with two rows of overlapping plates.

Social Behavior: Like almost all Corydoras, it lives in huge flocks in the wild. In the aquarium, it requires a minimum of 6-8 conspecifics. Relentlessly patrols the sand with its snout, stopping to rest in a group under shelters created by wood or flat rocks.

Coloration and Sexual Dimorphism: Faded silver/bronze base. Features light, blurry dark stippling on the head and body, without a sharp pattern. A faint, darker lateral band and iridescent green reflections on the branchial preopercles are often visible. Adult females are wider.

Aquarium Setup: Mandatory bottom of very soft quartz or silica sand. The tank (minimum 80 cm / 32 inches edge) must have heavily planted areas with Echinodorus and interwoven branches. The use of peat in the filter or Catappa leaves to slightly amber and acidify the water is advisable.

Diet and Feeding: In the wild, it preys on small worms and aquatic entomofauna of the bottom. In the aquarium, it must be fed specifically (not just leftovers) with sinking granules for bottom fish and supplemented a couple of times a week with frozen brine shrimp and bloodworms.

Water Quality: Requires clean water with very low nitrogenous compounds (nitrates <20 mg/L). Temperature between 22 and 26°C (72-79°F), pH 6.0-7.2. Hardness GH 2-12. Water flow should be moderate and the substrate superficially siphoned to prevent pathogenic bacteria in the sludge.

Compatibility and Tankmates: Peaceful fish ideal for community tanks. Coexists very well with all small tetras, vegetarian loricariids, and peaceful dwarf cichlids. Given its peaceful nature, it would suffer enormous stress in the presence of agitated fish or predatory loaches.

Aquarium Reproduction: Rare. Typical reproduction of the genus stimulated by thermal drops and high atmospheric pressure. Glues single eggs or small clusters to large surfaces (glass, large leaves) in current. Breeders tend to eat the eggs if not separated or heavily fed.

Risks and Diseases: Abrasion of barbels on sharp substrates is a highly fatal factor resulting in fungal infections. Intolerant to dissolved salt in the water and aggressive anti-ectoparasitic treatments (Copper, Formalin).