Firefish Goby and Koi Compatibility Overview
Firefish Goby and Koi are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Firefish Goby | Koi | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 50โ75ยฐF | โ ๏ธ 72โ75ยฐF (narrow) |
| pH Range | 8.1โ8.4 | 7.0โ8.5 | โ ๏ธ 8.1โ8.4 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 3.0 in | 24 in | โ 8ร difference |
| Min. Group | 1+ | 2+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Firefish Goby โ Nemateleotris magnifica
The Firefish Goby is a popular choice for saltwater aquariums due to its vibrant colors and peaceful nature. These goby fish thrive in well-maintained tanks with plenty of live rock for them to explore. They are best kept in pairs or small groups and can be a great addition to a community tank with compatible species.
โ Full Firefish Goby 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 Firefish Goby live with Koi?
Generally not recommended. Firefish Goby and Koi are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. 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 Firefish Goby and Koi together?
A minimum of 100 gallons is recommended for keeping Firefish Goby and Koi together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Firefish Goby and Koi?
72โ75ยฐF (narrow) โ inside Firefish Goby's 72โ82ยฐF and Koi's 50โ75ยฐF.
Is a Firefish Goby aggressive toward a Koi?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Firefish Goby 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 | 180 gal | Best when keeping larger schools or reducing territorial pressure. |