Flame Angelfish and Koi Compatibility Overview
Flame Angelfish 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 | Flame Angelfish | Koi | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 50โ75ยฐF | โ ๏ธ 72โ75ยฐF (narrow) |
| pH Range | 8.1โ8.4 | 7.0โ8.5 | โ ๏ธ 8.1โ8.4 (narrow) |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 4.0 in | 24 in | โ 6ร difference |
| Min. Group | 1+ | 2+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Flame Angelfish โ Centropyge loricula
The Flame Angelfish is a popular choice for saltwater aquariums due to its vibrant coloration and peaceful nature. It requires a spacious tank with plenty of swimming space and a stable water environment. With proper care, it can thrive in a community tank with compatible species.
โ Full Flame Angelfish 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 Flame Angelfish live with Koi?
Generally not recommended. Flame Angelfish 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 Flame Angelfish and Koi together?
A minimum of 100 gallons is recommended for keeping Flame Angelfish and Koi together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Flame Angelfish and Koi?
72โ75ยฐF (narrow) โ inside Flame Angelfish's 72โ82ยฐF and Koi's 50โ75ยฐF.
Is a Flame Angelfish aggressive toward a Koi?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Flame Angelfish 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. |