Koi and Peacock Cichlid Compatibility Overview
Koi and Peacock Cichlid are generally not recommended to be housed together. Koi is a cool-water fish and Peacock Cichlid 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 | Peacock Cichlid | Verdict |
|---|---|---|---|
| Temperature | 50โ75ยฐF | 73โ84ยฐF | โ ๏ธ 73โ75ยฐF (narrow) |
| pH Range | 7.0โ8.5 | 7.5โ9.0 | โ 7.5โ8.5 |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 24 in | 5.1 in | โ 5ร difference |
| Min. Group | 2+ | 4+ | 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.
Peacock Cichlid โ Aulonocara stuartgranti
The Peacock Cichlid, Aulonocara nyassae, is a stunning fish with vibrant blue and yellow colors. These fish are known for their aggression and require a mature and well-maintained tank. They are best kept in pairs or in a species-specific tank. Careful attention must be given to water parameters and tank setup to ensure their health and well-being.
Frequently Asked Questions
Can Koi live with Peacock Cichlid?
Generally not recommended. Koi and Peacock Cichlid are generally not recommended to be housed together. Koi is a cool-water fish and Peacock Cichlid 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 Peacock Cichlid together?
A minimum of 100 gallons is recommended for keeping Koi and Peacock Cichlid together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Koi and Peacock Cichlid?
73โ75ยฐF (narrow) โ inside Koi's 50โ75ยฐF and Peacock Cichlid's 73โ84ยฐF.
Is a Koi aggressive toward a Peacock Cichlid?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Koi and Peacock Cichlid
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. |