Harlequin Rasbora

Overview

The Harlequin Rasbora (Trigonostigma heteromorpha) is one of the most popular and hardy rasboras, known for its distinctive black triangular patch on a copper-orange body. Excellent beginner fish.

Water Parameters

• Temperature: 22–28°C (72–82°F)
• pH: 5.0–7.5 (adaptable)
• Hardness: 4–15 dGH

Tank Setup

• Minimum tank size: 55 litres for 8+
• Decor: Planted with open swimming space; dark substrate enhances colour

Diet

• Base: Quality flake, micro pellets
• Treats: Frozen daphnia, bloodworms, brine shrimp

Temperament & Tank Mates

• Temperament: Peaceful, active schooling fish
• Best companions: All peaceful community fish — tetras, corydoras, gouramis, dwarf shrimp
• Schooling: Minimum 8; they school tightly

Breeding

• Difficulty: Easy; scatter spawner
• Process: Fine-leaved plants; remove parents

Common Issues

• Extremely hardy; one of the best beginner fish
• Lifespan: 3–5 years