Chili Rasbora and Koi Compatibility Overview
Chili Rasbora and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Chili Rasbora is tropical, so the usable temperature range decides this pairing. Koi will eat chili rasboras. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Chili Rasbora | Koi | Verdict |
|---|---|---|---|
| Temperature | 68โ82ยฐF | 50โ75ยฐF | โ 68โ75ยฐF |
| pH Range | 4.0โ7.0 | 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
Chili Rasbora โ Boraras brigittae
Vivid red nano fish from Borneo blackwater habitats. Extremely small โ only safe with fish too small to swallow them.
โ Full Chili Rasbora 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 Chili Rasbora live with Koi?
Generally not recommended. Chili Rasbora and Koi are generally not recommended to be housed together. Koi is a cool-water fish and Chili Rasbora is tropical, so the usable temperature range decides this pairing. Koi will eat chili rasboras. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Chili Rasbora and Koi together?
A minimum of 100 gallons is recommended for keeping Chili Rasbora and Koi together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Chili Rasbora and Koi?
68โ75ยฐF โ inside Chili Rasbora's 68โ82ยฐF and Koi's 50โ75ยฐF.
Is a Chili Rasbora aggressive toward a Koi?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Chili Rasbora 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. |