Diancema Tetra

Geographic Origin and Biotope: Widely distributed in the Amazon River basin (Brazil). Mostly inhabits slow-flowing rivers, channels, oxbows, and marginal areas of the flooded forest where the waters are clear but loaded with tannins.

Taxonomy and Morphology: Hyphessobrycon diancema. An ovoid, compact, and robust characin. The overall appearance is understated, often mistaken for similar species of the same genus if not under perfect lighting conditions.

Social Behavior: Eminently peaceful and gregarious. Like all tetras, it needs the security of the group (minimum 8 specimens) to overcome its shyness and move boldly in the water column. Males engage in mild skirmishes.

Coloration and Sexual Dimorphism: Semi-transparent to olive-gray body, crossed by a delicate iridescent golden/silvery reflection. A small drop-shaped dark spot adorns the caudal peduncle. Females are noticeably rounder at the abdomen.

Aquarium Setup: An 80 cm (32 inches) hobbyist aquarium is ideal. Set up with a dark background, a generous rear band of stem plants, and some bogwood roots, leaving a large central area free for swimming.

Diet and Feeding: Undemanding (Omnivore/Micro-predator). Good quality flakes and micro-pellets form the staple diet, but it is vital to provide mosquito larvae, daphnia, and brine shrimp to stimulate activity and reproduction.

Water Quality: Very adaptable and hardy, ideal for the average aquarist. Thrives in soft to moderately hard waters (GH 1-12) and acidic to neutral pH (5.5-7.0), with stable temperatures.

Compatibility and Tankmates: Splendid "dither fish" for the South American community. Reassures shy bottom species (Apistogramma, Corydoras) with its lively swimming. Avoid pairing it with predatory fish like large cichlids or piranhas.

Aquarium Reproduction: Lacking parental care, they scatter eggs randomly among mosses or roots at dawn. For the survival of the offspring, it is necessary to use a bottom net and separate the adults immediately.

Risks and Diseases: Extremely robust, almost "bulletproof". The only real risk is jumping out of the tank if frightened (a lid is essential) or very heavy water pollution.