Red Irian Rainbowfish

Native to Lake Sentani in the highlands of Papua (Irian Jaya), Indonesia, this species lives in a relatively isolated lake system and has become one of the most visually striking rainbowfish in the hobby.

Males are genuinely stunning at maturity, developing a deep salmon-red to brick-red coloration across nearly their entire body, with a laterally compressed, almost hump-backed profile that makes them look more robust than most rainbowfish relatives. Females are considerably plainer, olive to yellowish-gold, but they're still graceful fish and serve an important role in driving male display. Young males often look disappointingly drab in shop tanks, so patience is required.

Water parameters are forgiving by rainbowfish standards. 0 range, moderate hardness, and temperatures between 22 and 28 degrees Celsius. They're not particularly sensitive and will tolerate a range of conditions once established, though soft acidic water long-term tends to suppress their color and health.

Diet is easy. They accept high-quality flake, pellets, and frozen or live foods like daphnia, brine shrimp, and bloodworm readily. A varied diet keeps color vivid and condition good.

Temperament is peaceful in the broad sense, though males do posture and display toward one another constantly. They're energetic, open-water swimmers and need horizontal space more than raw volume. If you like large, colorful, active fish that reward good care with genuinely impressive color, these are worth building a tank around.