Black Phantom Tetra and Koi Compatibility Overview
Black Phantom Tetra and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Black Phantom Tetra 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 | Black Phantom Tetra | Koi | Verdict |
|---|---|---|---|
| Temperature | 68โ82ยฐF | 50โ75ยฐF | โ 68โ75ยฐF |
| pH Range | 5.0โ7.0 | 7.0โ8.5 | โ ๏ธ 7.0โ7.0 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.4 in | 24 in | โ 17ร difference |
| Min. Group | 8+ | 2+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Black Phantom Tetra โ Hyphessobrycon megalopterus
The Black Phantom Tetra is a popular freshwater fish known for its striking black and silver coloration. It is generally peaceful and can be kept in a community tank with other non-aggressive species. They require a well-maintained tank with a moderate water flow and a good cover of plants.
โ Full Black Phantom Tetra 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 Black Phantom Tetra live with Koi?
Generally not recommended. Black Phantom Tetra and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Black Phantom Tetra 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 Black Phantom Tetra and Koi together?
A minimum of 100 gallons is recommended for keeping Black Phantom Tetra and Koi together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Black Phantom Tetra and Koi?
68โ75ยฐF โ inside Black Phantom Tetra's 68โ82ยฐF and Koi's 50โ75ยฐF.
Is a Black Phantom Tetra aggressive toward a Koi?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Black Phantom Tetra 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. |