Ember Tetra and Koi Compatibility Overview
Ember Tetra and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Ember 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 | Ember Tetra | Koi | Verdict |
|---|---|---|---|
| Temperature | 73โ84ยฐF | 50โ75ยฐF | โ ๏ธ 73โ75ยฐF (narrow) |
| pH Range | 5.5โ7.0 | 7.0โ8.5 | โ ๏ธ 7.0โ7.0 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 0.8 in | 24 in | โ 30ร difference |
| Min. Group | 8+ | 2+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Ember Tetra โ Hyphessobrycon amandae
Tiny orange-red schooling tetra that is among the most adaptable nano fish. Peaceful with everything too small to eat them.
โ Full Ember 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 Ember Tetra live with Koi?
Generally not recommended. Ember Tetra and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Ember 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 Ember Tetra and Koi together?
A minimum of 100 gallons is recommended for keeping Ember Tetra and Koi together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Ember Tetra and Koi?
73โ75ยฐF (narrow) โ inside Ember Tetra's 73โ84ยฐF and Koi's 50โ75ยฐF.
Is a Ember Tetra aggressive toward a Koi?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Ember 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. |