Sulawesi Rainbowfish

Adults of this species reach up to 8 cm in length. Their bodies are olive-colored, while the fins are bright yellow, and a striking blue line runs along the entire length of the body from tail to head. Males differ from females by their more intense coloration and noticeably larger fins.

This species is endemic to Sulawesi Island in Indonesia. These fish inhabit clear, small rivers that flow down hillsides covered with lush tropical forests.

This calm and peaceful species coexists well with other fish of similar size and temperament, provided they can inhabit a similar environment. It is recommended to keep them in schools of at least 6–8 individuals, with a ratio of 1 male to 2–3 females.

For a small school of these fish, an aquarium of at least 70 liters will be required. The decor should include an abundance of floating and rooted plants, arranged in groups to leave sufficient open areas for free swimming. The choice of other decorative elements is at the discretion of the aquarist. Particular attention should be paid to maintaining high water quality. Weekly water changes of at least 25% of the volume, as well as the installation of an effective filtration system, are key conditions for the successful keeping of Sulawesi Rainbowfish. Contrary to a widespread belief, this species does not need salt added to its water, although it tolerates mildly brackish conditions.

The fish readily accept all types of popular foods, including dry, frozen, and live. A varied diet consisting of high-quality products will allow them to display the full beauty of their coloration. It is desirable to include live foods in their diet at least once a week, if possible.

Breeding these fish in a home aquarium does not present significant difficulties. Their ability to reproduce offspring is maintained throughout the year. For successful spawning, it is important to provide thickets of fine-leaved or low-growing plants, as well as mosses; artificial alternatives are also suitable. The mating period lasts up to two weeks, during which the female lays portions of eggs daily. The eggs are attached to the surface of plants with thin adhesive threads. Notably, one male can fertilize several clutches from different females. Since these fish lack parental instincts, adult individuals often eat their own offspring. To save the fry, the eggs must be promptly removed from the main aquarium and carefully transferred to a separate tank where the water parameters are identical. To provide the necessary conditions in the new aquarium, a heater and a simple sponge air-lift filter will suffice. The fry emerge after 5–10 days, with this period depending on water temperature. In the initial stage of life, they will require micro-foods, such as infusoria; subsequently, they can transition to specialized powdered foods or Artemia nauplii.

Health problems usually arise only as a result of injuries or keeping in unsuitable conditions, which leads to a weakening of the immune system and, as a rule, provokes the development of various diseases. At the first signs of illness, the primary task is to check the water parameters for excesses or dangerous concentrations of toxic substances (nitrates, nitrites, ammonia, etc.). After bringing all indicators back to normal, treatment can begin.

When purchasing, choose active, lively individuals with clean fins and scales, free from visible damage or growths. Avoid fish showing signs of emaciation, sunken bellies, or unnatural behavior, such as constantly hovering at the bottom or attempting to stay separate from the school. As the species is sensitive to environmental quality, it is important to ensure that the store's aquarium maintains stable water parameters and cleanliness, and that the fish themselves do not appear stunted.