Angfa Rainbowfish

Adults can reach a length of approximately 12 cm. A distinctive feature of this fish is its bright yellow body coloration, accentuated by a black stripe running along the lateral line. Its appearance is similar to Axelrod's Rainbowfish, but the latter differs in having red fins.

The species inhabits mountain streams in New Guinea (Indonesia) at altitudes of 200 to 400 meters above sea level. It prefers areas with clean, oxygen-rich water, moderate currents, and dense riparian vegetation. In nature, the water in these biotopes is characterized by neutral to slightly acidic pH values of 6.5 to 7.5 and a temperature range of 24–26 °C.

This active and lively fish feels comfortable in a group of its own kind or with other Rainbowfish species. It can also coexist well with many non-aggressive and non-territorial aquarium fish of similar size.

The Angfa Rainbowfish is rarely encountered in aquariums, which explains the scarcity of information on successful keeping of this species in artificial conditions. Creating an environment close to its natural habitat appears to be the optimal approach. For a school of 6–8 individuals, a spacious aquarium of 150 liters or more will be required. A simple setup is recommended, including a stony substrate and driftwood. The use of plants that can attach to rocks or wood, such as Anubias, Bucephalandra, various aquatic mosses, and ferns, is also permissible. It is important to maintain high pH and GH values. Water purity is ensured by an efficient filtration system and regular aquarium maintenance.

Acclimated fish will likely readily accept most common foods, both dry and frozen or live.

Reproduction in captivity is not well studied, however, to stimulate spawning, it is recommended to use a separate aquarium of 40–60 liters with soft, slightly acidic water. Fine-leaved plants or special synthetic spawning mops are used as spawning substrate. After spawning is complete, the substrate with the eggs should be transferred to a separate container to protect the future fry from being eaten by the adults.

No specific diseases unique to this species have been recorded. Like other members of the Melanotaeniidae family, this species is susceptible to standard aquarium fish diseases when kept in improper conditions, especially with poor filtration or accumulation of organic waste. They are sensitive to abrupt changes in water hydrochemical parameters.

• Bacterial infections arising from stress or injuries
• Ichthyophthiriasis and other parasitic infestations due to lack of quarantine
• Fin rot, developing in water with high nitrate content

Prevention involves maintaining stable water parameters, regular partial water changes, and ensuring good aeration. When using medications, the species' sensitivity to certain chemical compounds should be considered, so it is recommended to temporarily remove activated carbon from the filter during treatment.

When selecting individuals, pay attention to the fish's activity and the cleanliness of its skin. A healthy rainbowfish should show curiosity, have vibrant coloration, and feed actively. Avoid purchasing fish with signs of emaciation, fin damage, body film, or unnatural behavior, such as prolonged hovering at the surface or bottom of the aquarium. It is recommended to acquire a group of 6 or more individuals to reduce stress levels.