This fish is known by several common names. Most often, it is called the Red Rainbowfish or Glossolepis incisa. Its scientific name is Glossolepis incisa, and it belongs to the family Melanotaeniidae, or Rainbowfishes.
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. Data.
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.
The essentials: size, tank volume, water parameters and care
An adult reaches 15 cm in length. Plan the tank around the maximum size: the fish quickly outgrows a cramped setup.
The recommended volume is 150 L. A smaller tank speeds up nitrate build-up and raises stress levels.
Temperature 22–25 °C, pH 7–8, hardness 8–20 dGH. Stability matters more than exact values: sudden swings are harder on the fish than a small deviation from the ideal.
Around 6 years when kept properly. Lifespan depends directly on tank volume, water quality and a varied diet.
Temperament: peaceful (regular). Keep this in mind when choosing tank mates.
Recommended setup: medium group (6–8 individuals). Ignoring this is a common cause of stress and disease.
Diet type: any (universal). Feed small portions that are finished within a couple of minutes — overfeeding does more harm than underfeeding.
The scientific name of the species is Glossolepis incisa, family Rainbowfishes (Melanotaeniidae).
The water suits 113 of 208 plants in the catalogue — the easiest ones are shown first.
African Onion PlantAfzelius's AnubiasAmazon FrogbitAmazon SwordAnacharisAnubiasArrowhead CryptAsian WatermossDwarf CloverDwarf CloverDwarf HygrophilaDwarf SagittariaDwarf ValGuppy GrassHornwortJava MossMoneywortMud SwordNarrow Leaf AnacharisNarrow-leaf CloverStringy MossTaiwan MossTape GrassUssuri Watermilfoil
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