Description
Harlequin Rasbora (Trigonostigma heteromorpha)
📌 Basic Info
Scientific Name: Trigonostigma heteromorpha
Common Name: Harlequin Rasbora, Red Rasbora
Size: 1.5 – 2 inches (4–5 cm)
Lifespan: 5 – 8 years
Tank Zone: Middle swimmers
🌊 Water Parameters
TDS (Total Dissolved Solids): 80 – 200 ppm
pH: 6.0 – 7.5
Temperature: 23°C – 28°C (73°F – 82°F)
Water Type: Soft to moderately hard, clean water
🐟 Characteristics
Peaceful, schooling fish → great for community aquariums
Orange body with a distinct black triangular patch on the back half
Active swimmers, best in planted tanks
Hardy and beginner-friendly
🍽️ Food
Type: Omnivorous
Diet: High-quality flakes, micro-pellets, frozen/live foods (daphnia, brine shrimp, bloodworms)
Feeding Frequency: 1–2 times daily, small portions
🛠️ Maintenance
Weekly water change: 20–30%
Prefers planted aquariums with swimming space
Stable water parameters, gentle filtration
👥 Social Behavior
Minimum Group Size: 6 (better in 8–10+)
Tank Mates: Peaceful fish like tetras, rasboras, guppies, mollies, gouramis, corydoras, shrimps, snails
Avoid: Aggressive or fin-nipping fish (barbs, large cichlids, bettas)
✅ Do’s
Keep them in groups for natural schooling
Provide live plants, driftwood, and hiding spots
Maintain stable water quality
❌ Don’ts
Don’t keep them alone or in pairs (they get stressed)
Don’t expose them to sudden water changes
Don’t overcrowd the tank
⭐ Quick Tips
One of the most famous rasboras in the hobby
Ideal for community and planted aquariums
Great choice for beginners and experienced aquarists alike
