Glowlight Tetra and Koi Compatibility Overview
Glowlight Tetra and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Glowlight 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 | Glowlight Tetra | Koi | Verdict |
|---|---|---|---|
| Temperature | 75โ82ยฐF | 50โ75ยฐF | โ ๏ธ 75โ75ยฐF (narrow) |
| pH Range | 5.5โ7.5 | 7.0โ8.5 | โ ๏ธ 7.0โ7.5 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.6 in | 24 in | โ 15ร difference |
| Min. Group | 6+ | 2+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Glowlight Tetra โ Hemigrammus erythrozonus
The Glowlight Tetra is a vibrant, peaceful community fish known for its silver body and bright red-gold highlights. It thrives in a well-planted tank with plenty of swimming space and a gentle water flow. These tetras are easy to care for and are suitable for beginners.
โ Full Glowlight 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 Glowlight Tetra live with Koi?
Generally not recommended. Glowlight Tetra and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Glowlight 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 Glowlight Tetra and Koi together?
A minimum of 100 gallons is recommended for keeping Glowlight Tetra and Koi together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Glowlight Tetra and Koi?
75โ75ยฐF (narrow) โ inside Glowlight Tetra's 75โ82ยฐF and Koi's 50โ75ยฐF.
Is a Glowlight Tetra aggressive toward a Koi?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Glowlight 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. |