Harlequin Rasbora (Trigonostigma heteromorpha) is a small, peaceful freshwater fish known for its distinctive black triangular patch on a bright copper-orange body. It is an ideal schooling species for community aquariums.
Out of Stock
Harlequin Rasbora (Trigonostigma heteromorpha) is a small, peaceful freshwater fish known for its distinctive black triangular patch on a bright copper-orange body. It is an ideal schooling species for community aquariums.
Bright copper-orange body with a distinctive black triangular patch starting behind the dorsal fin and extending toward the tail. Laterally compressed, streamlined body with transparent fins. Males are slightly slimmer and more intensely colored; females are slightly rounder with paler colors.
4–6 years with proper care
Omnivorous; feeds on high-quality flakes, pellets, and frozen foods. Supplement with live foods such as daphnia, brine shrimp, and micro worms. Occasional blanched vegetables like zucchini or spinach support health and coloration.
Harlequin Rasboras are excellent for community aquariums due to their peaceful nature, vibrant coloration, and active schooling behavior. They add charm and movement to planted tanks.
Beginner to Intermediate – hardy but prefers stable water conditions and schooling.
20+ gallons (for a small school)
6.0 to 7.5
2–15 dGH
72–81°F (22–27°C)
2 inches
Small tetras, rasboras, danios, dwarf gouramis, peaceful barbs. Avoid large or aggressive species.
Large or aggressive fish that may eat or stress them. Avoid fin-nipping species.
Trigonostigma heteromorpha
Cyprinidae
Southeast Asia – Malaysia, Singapore, Thailand; slow-moving streams with vegetation.
Highly social; best kept in schools of 6 or more. Peaceful and compatible with other small community fish.
Feed 2–3 times daily with flakes, pellets, and frozen/live foods. Supplement occasionally with blanched vegetables for optimal health and color.
Egg-scatterer; deposits eggs among fine-leaved plants. Adults do not guard eggs. Condition males and females with protein-rich foods before spawning. Fry feed on infusoria or newly hatched brine shrimp.
pH: 6.0–7.5, Temperature: 72–81°F (22–27°C), Hardness: 2–15 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <20 ppm
Sensitive to poor water quality. Prone to ich, stress-related diseases, and fin damage if kept with aggressive tankmates. Maintain clean water and proper diet.
Peaceful, active, and social. Best kept in groups of 6 or more to encourage natural schooling behavior. Compatible with other small, peaceful community fish.
Native to Southeast Asia, especially Malaysia, Singapore, and Thailand, Harlequin Rasboras inhabit slow-moving streams and rivers with dense vegetation. Adults reach up to 2 inches. They thrive in planted tanks with gentle water flow and open swimming areas. Ideal for beginner and intermediate aquarists, they are hardy, peaceful, and display vibrant colors in schools.