Compatibility Overview
Clown Loach and Harlequin Rasbora can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
| Factor | Clown Loach | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 77–86°F | 72–81°F | ✅ 77–81°F |
| pH Range | 6.0–7.5 | 5.5–7.5 | ✅ 6.0–7.5 |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 12 in | 1.75 in | ❌ 7× difference |
| Min. Group | 5+ | 8+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Clown Loach — Chromobotia macracanthus
Striking striped loach that grows very large. Peaceful with fish but will eat shrimp, snails and tiny fish.
Harlequin Rasbora — Trigonostigma heteromorpha
Active mid-level schooling fish with a distinctive black triangular patch. One of the best all-around community tank fish.
Frequently Asked Questions
Can Clown Loach live with Harlequin Rasbora?
With significant caution and a larger tank. Clown Loach and Harlequin Rasbora can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 100 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Clown Loach and Harlequin Rasbora together?
A minimum of 100 gallons is recommended for keeping Clown Loach and Harlequin Rasbora together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Clown Loach and Harlequin Rasbora?
77–81°F
Is a Clown Loach aggressive toward a Harlequin Rasbora?
Clown Loach is peaceful and Harlequin Rasbora is peaceful. Narrow temperature overlap (77–81°F) — keeping the tank at exactly 78–80°F is needed for both species.