Rosy Tetra

The body of the Rosy Tetra has the classic shape for small representatives of this genus, distinguished by a magnificent pink coloration with contrasting black elements on the fins, the tips of which are marked with white. A similar pattern and shade—from delicate pink to rich coral—are also characteristic of the Ornate Tetra, but its coloration is less intense, giving it a duller appearance.

The species inhabits the rivers of the Guiana Shield in northern South America — the Essequibo, Corantijn and Suriname — in Guyana, Suriname and Brazil. Their natural habitat consists of small, slow-flowing tributaries of large rivers, located under the canopy of the tropical forest. The water in these rivers is usually turbid and contains a lot of silt, and the Tetras' diet primarily consists of small invertebrates.

In a well-maintained aquarium, the Rosy Tetra exhibits activity and reveals the full beauty of its coloration. This is a schooling species, requiring a group of at least 6 individuals. They thrive in the company of closely related species, such as the Black Tetra, White Tetra, Red-Spotted Tetra, or Ornate Tetra. Noisy or aggressive fish are not suitable tank mates; the Rosaceus Tetra should only be kept with peaceful and non-predatory species.

The Tetra is sensitive to water quality, so a productive filter is a key factor for successful keeping. To avoid excessive water movement in the aquarium, the outflow from the filter should be directed towards a side wall. Lighting should be moderate; powerful light sources are not recommended. In addition, essential equipment includes a heater and an aerator. For aquarium decoration, use dense plant thickets, placing them along the side and back walls. River sand is ideal as a substrate. To create a turbid water effect, dried leaves can be used, replaced every two weeks, as well as a bag of alder cones. It is important to purchase peat only from pet stores, where it is specially treated and prepared for aquarium use, and never to collect it from natural bodies of water.

The Rosaceus Tetra is an omnivorous species, but its diet must be balanced and consist of high-quality foods. These fish require a significant amount of vitamins, so healthy food should make up a large part of their diet (60–80% of the total volume). They prefer live foods, such as bloodworms or daphnia, but can also eat soft plant parts.

Breeding the Rosaceus Tetra is a rather complex process that is unlikely to be within the capabilities of a beginner aquarist. Nevertheless, a healthy pair usually has no difficulty reproducing if kept in soft water and at a slightly elevated temperature, around 26°C. The male and female should be isolated, preferably in a separate breeding tank. The female lays eggs on thin leaves or stems of aquarium plants. After spawning, the parent fish should be immediately removed from the aquarium. Fry begin to swim freely after 3–4 days. Daily partial water changes with fresh water are mandatory, and it is important to ensure that the fry are not harmed during this process.

This species is highly resilient and rarely suffers from diseases, provided adequate conditions and regular aquarium maintenance.

When selecting individuals in a store, pay attention to their activity and the integrity of their fins. A healthy fish should exhibit natural schooling behavior, actively swim in the water column, and show no visible damage, sores, or white film on its scales. Avoid purchasing fish that appear apathetic, stay near the surface or bottom away from the group, or show signs of emaciation or an unnaturally bloated belly. — Make sure there are no dead fish in the tank, as this indicates poor maintenance or the presence of infections. — Check the coloration: in healthy tetras, it should be vibrant, without pale or patchy areas. — Keep in mind that this species is often confused with closely related tetras, so carefully examine the fish to ensure it matches the species characteristics.