Harlequin Rasbora (Trigonostigma heteromorpha) | Live Freshwater Aquarium Fish

Harlequin Rasbora (Trigonostigma heteromorpha)

The Harlequin Rasbora is one of the most elegant and reliable schooling fish available in the freshwater aquarium hobby. Known for its shimmering copper-orange body and distinctive black triangular marking, this peaceful species creates a stunning display when kept in groups.

Harlequin Rasboras are active yet calm swimmers that thrive in community aquariums. Their schooling behavior, vibrant coloration, and easy-going temperament make them an excellent choice for both beginner and experienced aquarists.

Whether you're building a lush planted aquarium or adding life to a peaceful community tank, Harlequin Rasboras provide movement, color, and natural schooling behavior that never gets old.

Why You'll Love Them

✔ Beautiful copper-orange coloration

✔ Distinctive black "harlequin" marking

✔ Excellent schooling behavior

✔ Peaceful community fish

✔ Beginner-friendly and hardy

✔ Perfect for planted aquariums

Care Information

Scientific Name: Trigonostigma heteromorpha

Common Name: Harlequin Rasbora

Adult Size: 1.5–2 inches

Temperament: Peaceful

Care Level: Easy

Diet: Omnivore

Minimum Tank Size: 10 Gallons

Temperature: 72–82°F

pH: 6.0–7.8

Origin: Southeast Asia

Swimming Level: Midwater

Lifespan: 5–8 Years

Tank Recommendations

Harlequin Rasboras should be kept in groups of at least 6 individuals, though schools of 10 or more create the most impressive display and encourage natural behavior.

Excellent tankmates include:

• Neon Tetras
• Cardinal Tetras
• Ember Tetras
• Corydoras Catfish
• Gouramis
• Rams
• Apistogramma
• Peaceful community fish

A planted aquarium with open swimming areas and darker backgrounds will help showcase their best coloration.

What You'll Receive

• Healthy, hand-selected Harlequin Rasboras
• Professionally packed for safe transport
• Live arrival guarantee
• Responsive customer support from fellow hobbyists