Tank Setup
- Tank size: 10 gallons for a school of 6–8, 20 gallons for 10–15
- Plants: Densely planted with broad-leaved plants — they naturally inhabit shaded, vegetated waters
- Lighting: Moderate to subdued — their colors look best under soft lighting
- Substrate: Dark substrate enhances their copper coloration
Water Parameters
- Temperature: 73–82°F
- pH: 6.0–7.5 (slightly acidic preferred)
- GH: 2–10 dGH (soft to moderately hard water)
Tank Mates
One of the best community fish — compatible with nearly all peaceful species. They make excellent betta tank mates because they stay in the mid-water column and don't have flashy fins that trigger aggression.
Frequently Asked Questions
How many harlequin rasboras should I keep?
Minimum 6, ideally 10–15. Larger schools produce the most impressive display and result in less stress for the fish.
Compatible Tank Mates
✓ betta fish✓ neon tetra✓ corydoras catfish✓ cherry shrimp✓ guppy✓ ember tetra✓ otocinclus✓ kuhli loach✓ dwarf gourami✓ mystery snail✓ nerite snail