Serpae Tetra Care Guide - Aquarium Setup, Diet & Breeding

The Serpae Tetra is a richly coloured small characin with a deep, laterally compressed body. Its base colour ranges from coppery red to deep ruby, usually marked by a dark comma-shaped or shoulder blotch behind the gill cover. The dorsal fin often carries a striking black-and-white pattern, while the remaining fins may glow red or orange.

These active fish spend much of their time in the middle levels of the aquarium, moving in loose groups and displaying to one another. Males may posture and flare their fins during brief contests, but well-maintained groups usually settle into lively, entertaining social behaviour rather than serious conflict.

In the wild, they inhabit quiet tributaries, forest streams and shallow floodplain waters where submerged vegetation, leaf litter and tangled roots provide cover. The water in these habitats can be stained by tannins and may vary considerably with seasonal rainfall.

Hyphessobrycon eques has long been popular in the aquarium trade, although selectively bred forms may show stronger red colouration or altered fin markings than wild fish. Its energetic nature and occasional fin-nipping habit make group size and tankmate selection especially important.

Serpae Tetras are native to tropical South America, particularly tributaries and slow-moving waters of the Amazon, Paraguay and Paraná river basins. Their range includes parts of Brazil, Peru, Bolivia, Paraguay and neighbouring areas.

A group of Serpae Tetras should be kept in an aquarium of at least 75 litres, with a footprint around 60 × 30 cm or larger so they have room to swim. Use open swimming space across the front and centre, balanced with dense planting, driftwood, roots and shaded areas around the edges. A dark substrate can enhance their colours, while leaf litter or other natural-looking cover helps reproduce the character of their South American habitat. Keep the aquarium securely covered because active tetras can jump.

Up to about 4 cm (1.6 in) in total length. Females are often slightly larger and deeper-bodied than males.

Serpae Tetras are omnivores and readily accept quality small flakes, micro-pellets and granules. For vibrant colour and good condition, regularly supplement their diet with frozen or live foods such as brine shrimp, daphnia, bloodworms and mosquito larvae. Offer small portions once or twice daily, using food that can be eaten quickly by their relatively small mouths.

Serpae Tetras suit lively community aquariums containing similarly sized, peaceful fish such as black neon tetras, lemon tetras, larger rasboras, corydoras, small peaceful barbs and suitable peaceful dwarf cichlids. Keep them in a proper group to spread their attention and reduce persistent chasing. Avoid very slow or long-finned species such as bettas, fancy guppies and many gouramis, as Serpae Tetras may nip their fins, particularly when kept in too small a group.

Serpae Tetras are egg-scattering fish that can be bred in a separate, dimly lit breeding aquarium with soft, slightly acidic water and fine-leaved plants or a spawning mop. Condition the adults with plenty of live or frozen foods, then introduce a compatible pair or small group. Spawning usually takes place among the plants, after which the adults should be removed because they may eat the eggs. The eggs generally hatch within a day or two, and the tiny fry can be fed infusoria or another suitably fine first food before progressing to newly hatched brine shrimp.

Females are typically fuller-bodied, especially when carrying eggs, while males tend to be slimmer and may show more intense red colouration with a more strongly developed dorsal fin. The differences are subtle outside breeding condition.