Oscar and X Ray Tetra Compatibility Overview
Oscar and X Ray Tetra are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Oscar is aggressive and X Ray Tetra is peaceful. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Oscar | X Ray Tetra | Verdict |
|---|---|---|---|
| Temperature | 74โ81ยฐF | 72โ82ยฐF | โ 74โ81ยฐF |
| pH Range | 6.0โ8.0 | 6.0โ7.5 | โ 6.0โ7.5 |
| Temperament | aggressive | peaceful | โ Risk |
| Adult Size | 14 in | 1.8 in | โ 8ร difference |
| Min. Group | 1+ | 6+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
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.
X Ray Tetra โ Pristella maxillaris
The Pristella maxillaris, also known as the X-Ray Tetra, is a popular freshwater fish known for its unique appearance and peaceful nature. They are slender and iridescent, with a clear, almost x-ray-like body. They are best kept in groups of 6 or more and thrive in well-planted tanks with a moderate water flow.
Frequently Asked Questions
Can Oscar live with X Ray Tetra?
Generally not recommended. Oscar and X Ray Tetra are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Oscar is aggressive and X Ray Tetra is peaceful. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Oscar and X Ray Tetra together?
A minimum of 100 gallons is recommended for keeping Oscar and X Ray Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Oscar and X Ray Tetra?
74โ81ยฐF โ inside Oscar's 74โ81ยฐF and X Ray Tetra's 72โ82ยฐF.
Is a Oscar aggressive toward a X Ray Tetra?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Oscar and X Ray Tetra
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. |