Carla's Cory

Geographical Origin and Habitat: Very rare species endemic to the Iguazú River basin in Brazil and Argentina. Inhabits quiet river stretches characterized by very clear water and predominantly sandy substrates littered with dry leaves and organic debris.

Taxonomy and Morphology: Belongs to the Callichthyidae family. It is a medium-sized Corydoras (about 5 cm / 2 inches), with a short to moderate snout, well-defined dermal scutes, and classic posture. Morphologically similar to other Corydoras of the "reticulatus" group, although taxonomy remains evolving.

Social Behavior: Obligatory gregariousness: needs the presence of conspecifics to avoid wasting away. Keep in minimum groups of 6-8 units. Peaceful, it spends the entire day probing the sand with its barbels in search of tiny benthic prey.

Coloration and Sexual Dimorphism: Very complex and "mimetic" livery: silver-gray background covered by a dense and irregular dark reticulation or vermiculation all over the body. Has a diffuse dark spot on the dorsal fin. Dimorphism: adult females are decidedly wider and taller in the belly compared to males.

Aquarium Setup: Substrate imperatively of very fine sand (not sharp quartz). Very clean and well-filtered water. Tank furnished with dark wood and plants to create partial shade. A Ketapang cover on the bottom will perfectly replicate the biotope providing reassuring hiding places.

Diet and Feeding: Bottom micropredator. Often refuses poor quality dry foods. Feed high-quality protein sinking tabs, frequently alternated with brine shrimp, daphnia, and, in particular, frozen bloodworms to maintain active lipid reserves.

Water Quality: Moderately tolerant species but demanding in terms of bottom hygiene. Temperature 22-26°C (72-79°F). Soft or medium-hard water (GH 2-12) with pH between 6.0 and 7.2. Poor nitrate management or debris accumulation in the substrate inevitably leads to skin infections.

Compatibility and Cohabitation: Peaceful and excellent for Amazonian or Argentine community aquariums (if temperatures match). Shares space beautifully with Tetras (Gymnocorymbus ternetzi, Hyphessobrycon), peaceful Loricariids, and pencilfish. Avoid predators, large Cichlids, or aggressive bottom eaters.

Aquarium Breeding: Very rare in captivity due to poor availability. Follows classic reproductive triggers: cold thermal shock simulating the monsoon, oxygen increase, and hyper-protein diet. Lays on glass or broad plants in high current areas. Eggs subject to predation.

Risks and Diseases: Barbel deterioration due to abrasive substrates is the primary cause of death (starvation and stress). Marked sensitivity, like all armored fish, to copper, formalin, and table salt dissolved in the water.