Red Rainbowfish

These fish reach a length of approximately 15 cm. Males are distinguished by their rich red coloration, while females have a yellowish-olive hue. Interestingly, when the fish are kept in conditions close to the lower limit of the acceptable temperature range, all males display characteristic red tones. However, if the temperature is higher, only the dominant (alpha) male retains its vibrant coloration.

Endemic to the island of New Guinea, this species inhabits Lake Sentani, as well as nearby bodies of water. The Red Rainbowfish prefers shallow waters and shoals where there is dense aquatic and coastal vegetation. A distinctive feature of Lake Sentani is the stability of its aquatic environment, where hydrochemical parameters and temperature remain almost unchanged throughout the year.

These fish are peaceful and active. They coexist well with many well-known species, but due to their mobility and relatively large size, they can cause some disturbance to smaller and slower tankmates. It is recommended to keep them in a school consisting of at least 6–8 individuals of both sexes. With fewer numbers, the Red Rainbowfish can become timid and spend a significant portion of its time hiding among thickets.

For a school of several individuals, an aquarium of 150 liters or more will be required. The aquarium's decor can be arbitrary, but it should include both areas with dense vegetation and open zones for swimming. The Red Rainbowfish, being native to still waters, does not tolerate strong currents well. Therefore, internal equipment, especially filters, should be adjusted to minimize water movement in the aquarium. Another key aspect of caring for this species is maintaining stable conditions. Where possible, sudden fluctuations in temperature, as well as pH and GH parameters, should be avoided.

The Red Rainbowfish has no special dietary requirements. It readily accepts all popular types of food of suitable size — dry, live, or frozen. It is important to provide a varied diet, as a combination of different types of food positively affects the overall tone of the fish, which, in turn, contributes to brighter coloration.

Breeding this species is quite simple, and the fish can produce offspring year-round. Spawning lasts for about two days, usually occurring among low-growing plants with stiff leaves or in moss thickets. Over a hundred eggs are attached to these surfaces. Parents generally do not eat their offspring, unlike other aquarium inhabitants. If necessary, the eggs can be carefully transferred to a separate tank with identical water conditions. The incubation period lasts approximately 7–8 days. Tiny fry initially require microscopic food, such as infusoria. After about a week, they can be fed Artemia nauplii or special powdered food for tropical fish fry.

Health problems in these fish arise only as a result of injuries or when kept in unsuitable conditions, which weakens their immune system and provokes the development of various diseases. If the first symptoms appear, it is primarily necessary to check the water quality for any exceeding parameters or dangerous concentrations of toxic substances such as nitrites, nitrates, or ammonium. After detecting deviations, all water parameters should be stabilized to normal, and only then should treatment begin. More detailed information on symptoms and treatment methods can be found in the "Aquarium Fish Diseases" section. Data source: FishBase

When purchasing, choose active, mobile individuals with bright coloration appropriate for their sex. Avoid fish with damaged fins, film, body ulcers, or signs of emaciation, as these species are sensitive to water quality and stress during transportation. It is advisable to acquire fish from aquariums where they are kept in a school, as single individuals in a store often experience severe stress and appear timid.