Compatibility Overview
Clown Loach and Pea Puffer are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
| Factor | Clown Loach | Pea Puffer | Verdict |
|---|---|---|---|
| Temperature | 77–86°F | 74–82°F | ✅ 77–82°F |
| pH Range | 6.0–7.5 | 7.0–8.0 | ⚠️ 7.0–7.5 (narrow) |
| Temperament | peaceful | semi | ⚠️ Monitor |
| Adult Size | 12 in | 1 in | ❌ 12× difference |
| Min. Group | 5+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
Clown Loach — Chromobotia macracanthus
Striking striped loach that grows very large. Peaceful with fish but will eat shrimp, snails and tiny fish.
Pea Puffer — Carinotetraodon travancoricus
World's smallest pufferfish — intensely territorial and nippy despite tiny size. Will attack fins and eat shrimp and snails.
Frequently Asked Questions
Can Clown Loach live with Pea Puffer?
Generally not recommended. Clown Loach and Pea Puffer are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
What tank size do I need for Clown Loach and Pea Puffer together?
A minimum of 100 gallons is recommended for keeping Clown Loach and Pea Puffer together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Clown Loach and Pea Puffer?
77–82°F
Is a Clown Loach aggressive toward a Pea Puffer?
Clown Loach is peaceful and Pea Puffer is semi. Narrow temperature overlap (77–82°F) — keeping the tank at exactly 78–81°F is needed for both species.