Harlequin Rasbora

Harlequin Rasbora (Trigonostigma heteromorpha)

The Harlequin Rasbora is one of the most popular and reliable schooling fish in the freshwater aquarium hobby. Known for its beautiful copper-orange body and distinctive black triangular marking, this peaceful species brings vibrant color, graceful movement, and natural schooling behavior to community aquariums and planted tanks. Their timeless beauty and easy-going nature have made them a favorite among aquarists for generations.

Native to the slow-moving streams and peat swamps of Southeast Asia, Harlequin Rasboras thrive in planted aquariums with driftwood, natural décor, and open swimming space. Their warm coloration contrasts beautifully against green aquatic plants, creating a stunning display as schools move together throughout the aquarium. Larger groups often exhibit tighter schooling behavior, making them even more impressive to watch.

Harlequin Rasboras are extremely peaceful and adaptable, making them excellent tank mates for tetras, Corydoras, dwarf cichlids, gouramis, shrimp, and many other community species. They readily accept flakes, micro pellets, frozen foods, and other prepared diets, making them easy to feed and maintain.

Scientific Name: Trigonostigma heteromorpha
Care Level: Easy
Temperament: Peaceful
Diet: Omnivore
Adult Size: Up to 2 Inches
Minimum Tank Size: 15 Gallons
Origin: Southeast Asia
Plant Safe: Yes

If you're looking for a peaceful, colorful, and active schooling fish, the Harlequin Rasbora is an outstanding choice. Its striking markings, natural schooling behavior, and compatibility with planted aquariums make it a staple species for freshwater hobbyists of all experience levels.