Pretty tetra

Geographical Origin and Habitat: Holopristis pulchra is native to the upper Amazon basin, widely distributed across Peru, Colombia, and western Brazil. It primarily inhabits slow-flowing tributaries, forest streams, and flooded areas characterized by soft, acidic blackwaters rich in tannins from decaying vegetation.

Taxonomy and Morphology: It belongs to the family Characidae. It features a laterally compressed, relatively deep body compared to other Hemigrammus species, complete with a small adipose fin. Adults typically reach a maximum length of 4 to 5 cm.

Social Behavior: A peaceful and somewhat shy schooling fish. It must be kept in groups of at least 6-8 individuals to encourage natural shoaling behavior and minimize shyness. When kept in smaller numbers, they become stressed and remain hidden.

Coloration and Sexual Dimorphism: Features a silvery body with green and copper reflections. The standout feature is a bright golden-orange iridescent patch at the upper base of the caudal peduncle, bordered by a black wedge below it. Sexual dimorphism is subtle: mature females are slightly larger and rounder.

Aquarium Setup: Requires an aquarium of at least 60-80 liters, densely planted along the sides and back, leaving the center open for swimming. Dark substrate, driftwood roots, and dried leaves (like Catappa or beech) on the bottom are highly recommended to replicate natural blackwater conditions.

Diet and Feeding: An opportunistic omnivore. In captivity, it readily accepts high-quality dry flakes or micro-pellets. Its diet should be supplemented with live or frozen foods such as daphnia, brine shrimp, and bloodworms to maintain vibrant colors and vitality.

Water Quality: Prefers soft, acidic water conditions. Ideal parameters are pH 5.5 to 7.0, water hardness dGH below 10, and a stable temperature between 23°C and 27°C. Filtration should be efficient but gentle, avoiding strong currents that might exhaust the fish.

Compatibility and Cohabitation: Excellent for Amazonian community tanks. It coexists peacefully with other small tetras, pencilfish, dwarf cichlids (like Apistogramma), and peaceful bottom dwellers like Corydoras. Avoid housing with large, predatory tankmates.

Aquarium Breeding: Spawning is possible but requires a separate breeding tank with very soft (dGH 1-2), acidic (pH 5.5-6.0) water under dim lighting. Eggs are scattered among fine-leaved plants. Parents must be removed immediately after spawning to protect the eggs.

Risks and Diseases: Susceptible to common freshwater diseases such as ich (white spot disease) and fungal infections if water parameters fluctuate rapidly or if tank hygiene is neglected. Regular, small water changes are essential to prevent health declines.