Compatibility Overview
Cardinal Tetra and Clown Loach 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 | Cardinal Tetra | Clown Loach | Verdict |
|---|---|---|---|
| Temperature | 73–82°F | 77–86°F | ✅ 77–82°F |
| pH Range | 4.5–7.0 | 6.0–7.5 | ✅ 6.0–7.0 |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 1.5 in | 12 in | ❌ 8× difference |
| Min. Group | 6+ | 5+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Cardinal Tetra — Paracheirodon axelrodi
Brilliant red-and-blue schooling fish from the Rio Negro. Prefers soft, acidic, warm water — a natural companion for discus.
→ Full Cardinal Tetra care guide
Clown Loach — Chromobotia macracanthus
Striking striped loach that grows very large. Peaceful with fish but will eat shrimp, snails and tiny fish.
Frequently Asked Questions
Can Cardinal Tetra live with Clown Loach?
With significant caution and a larger tank. Cardinal Tetra and Clown Loach 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 Cardinal Tetra and Clown Loach together?
A minimum of 100 gallons is recommended for keeping Cardinal Tetra and Clown Loach together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Cardinal Tetra and Clown Loach?
77–82°F
Is a Cardinal Tetra aggressive toward a Clown Loach?
Cardinal Tetra is peaceful and Clown Loach is peaceful. Narrow temperature overlap (77–82°F) — keeping the tank at exactly 78–81°F is needed for both species.