Harlequin Rasbora

Trigonostigma heteromorpha

The Harlequin Rasbora, scientifically known as *Trigonostigma heteromorpha*, is a small, vibrant freshwater fish native to Southeast Asia, particularly found in the slow-moving waters of Malaysia, Singapore, Sumatra, and Thailand. This species is renowned for its striking appearance, exhibiting a distinctive, wedge-shaped black mark on the rear half of its body set against a shimmering orange to reddish-pink background. Harlequin Rasboras typically grow to about 5 cm (2 inches) in length and are known for their peaceful demeanor, making them a popular choice for community aquariums.

These schooling fish thrive in well-planted tanks with slightly acidic to neutral pH levels and temperatures ranging from 22 to 27°C (72 to 81°F). Harlequin Rasboras are socially inclined and prefer to be kept in groups of at least six, which promotes natural behavior and reduces stress. Their diet is omnivorous, consisting of high-quality flake foods, live or frozen brine shrimp, and daphnia. As a hardy species, they are relatively easy to care for, making them ideal for both novice and experienced aquarists. Their graceful movements and vivid coloration add lively dynamics and beauty to any aquarium setting.