Koi and Moonlight Gourami Compatibility Overview
Koi and Moonlight Gourami are generally not recommended to be housed together. Koi is a cool-water fish and Moonlight Gourami is tropical, so the usable temperature range decides this pairing. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Koi | Moonlight Gourami | Verdict |
|---|---|---|---|
| Temperature | 50โ75ยฐF | 77โ86ยฐF | โ No overlap |
| pH Range | 7.0โ8.5 | 6.0โ7.5 | โ ๏ธ 7.0โ7.5 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 24 in | 5.9 in | โ 4ร difference |
| Min. Group | 2+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
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.
Moonlight Gourami โ Trichopodus microlepis
The Moonlight Gourami is a beautiful freshwater fish known for its silvery blue color and red eyes. It is a peaceful community fish suitable for beginners and can thrive in a well-maintained aquarium. These fish are sensitive to water quality and require a spacious tank with plenty of swimming space.
Frequently Asked Questions
Can Koi live with Moonlight Gourami?
Generally not recommended. Koi and Moonlight Gourami are generally not recommended to be housed together. Koi is a cool-water fish and Moonlight Gourami is tropical, so the usable temperature range decides this pairing. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Koi and Moonlight Gourami together?
A minimum of 100 gallons is recommended for keeping Koi and Moonlight Gourami together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Koi and Moonlight Gourami?
There is no safe shared range: Koi needs 50โ75ยฐF and Moonlight Gourami needs 77โ86ยฐF.
Is a Koi aggressive toward a Moonlight Gourami?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Koi and Moonlight Gourami
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 | 180 gal | Best when keeping larger schools or reducing territorial pressure. |