Glass Catfish and Koi Compatibility Overview
Glass Catfish and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Glass Catfish 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 | Glass Catfish | Koi | Verdict |
|---|---|---|---|
| Temperature | 68โ79ยฐF | 50โ75ยฐF | โ 68โ75ยฐF |
| pH Range | 4.0โ7.0 | 7.0โ8.5 | โ ๏ธ 7.0โ7.0 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 2.6 in | 24 in | โ 9ร difference |
| Min. Group | 6+ | 2+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Glass Catfish โ Kryptopterus vitreolus
The Glass Catfish, Kryptopterus vitreolus, is a popular freshwater aquarium fish known for its unique, translucent body and iridescent scales. It is a peaceful species that thrives in groups and is suitable for beginners due to its hardy nature. These catfish are bottom-dwellers and require a well-decorated tank with plenty of swimming space.
โ Full Glass Catfish 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 Glass Catfish live with Koi?
Generally not recommended. Glass Catfish and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Glass Catfish 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 Glass Catfish and Koi together?
A minimum of 100 gallons is recommended for keeping Glass Catfish and Koi together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Glass Catfish and Koi?
68โ75ยฐF โ inside Glass Catfish's 68โ79ยฐF and Koi's 50โ75ยฐF.
Is a Glass Catfish aggressive toward a Koi?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Glass Catfish 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. |