Chili Rasbora and Oscar Compatibility Overview
Chili Rasbora and Oscar are generally not recommended to be housed together. Oscars will eat chili rasboras. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Chili Rasbora | Oscar | Verdict |
|---|---|---|---|
| Temperature | 68โ82ยฐF | 74โ81ยฐF | โ 74โ81ยฐF |
| pH Range | 4.0โ7.0 | 6.0โ8.0 | โ 6.0โ7.0 |
| Temperament | peaceful | aggressive | โ Risk |
| Adult Size | 0.8 in | 14 in | โ 18ร difference |
| Min. Group | 8+ | 1+ | 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
Oscar โ Astronotus ocellatus
Intelligent but aggressive cichlids that will eat any fish small enough to fit in their mouth. Require large tanks (75+ gallons) and robust tank mates.
Frequently Asked Questions
Can Chili Rasbora live with Oscar?
Generally not recommended. Chili Rasbora and Oscar are generally not recommended to be housed together. Oscars will eat chili rasboras. 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 Chili Rasbora and Oscar together?
A minimum of 100 gallons is recommended for keeping Chili Rasbora and Oscar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Chili Rasbora and Oscar?
74โ81ยฐF โ inside Chili Rasbora's 68โ82ยฐF and Oscar's 74โ81ยฐF.
Is a Chili Rasbora aggressive toward a Oscar?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Chili Rasbora and Oscar
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. |