Clown Loach and Koi Compatibility Overview
Clown Loach and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Clown Loach is tropical, so the usable temperature range decides this pairing. There is no shared temperature: Clown Loach needs 77โ86ยฐF and Koi needs 50โ75ยฐF. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Clown Loach | Koi | Verdict |
|---|---|---|---|
| Temperature | 77โ86ยฐF | 50โ75ยฐF | โ No overlap |
| pH Range | 6.0โ7.5 | 7.0โ8.5 | โ ๏ธ 7.0โ7.5 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 12 in | 24 in | โ ๏ธ 2.0ร difference |
| Min. Group | 5+ | 2+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Clown Loach โ Chromobotia macracanthus
Striking striped loach that grows very large. Peaceful with fish but will eat shrimp, snails and tiny fish.
โ Full Clown Loach care guide
Koi โ Cyprinus rubrofuscus
Large pond fish that require hundreds of gallons and cool water. Will eat any fish small enough to fit in their mouth.
Frequently Asked Questions
Can Clown Loach live with Koi?
Generally not recommended. Clown Loach and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Clown Loach is tropical, so the usable temperature range decides this pairing. There is no shared temperature: Clown Loach needs 77โ86ยฐF and Koi needs 50โ75ยฐF. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Clown Loach and Koi together?
A minimum of 100 gallons is recommended for keeping Clown Loach and Koi together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Clown Loach and Koi?
There is no safe shared range: Clown Loach needs 77โ86ยฐF and Koi needs 50โ75ยฐF.
Is a Clown Loach aggressive toward a Koi?
Clown Loach is peaceful and Koi is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Clown Loach and Koi
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 100 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 150 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 220 gal | Best when keeping larger schools or reducing territorial pressure. |