Oscar and Red Eye Tetra Compatibility Overview
Oscar and Red Eye Tetra are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Oscar is aggressive and Red Eye Tetra is semi. 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 | Red Eye Tetra | Verdict |
|---|---|---|---|
| Temperature | 74โ81ยฐF | 72โ79ยฐF | โ 74โ79ยฐF |
| pH Range | 6.0โ8.0 | 6.0โ8.0 | โ 6.0โ8.0 |
| Temperament | aggressive | semi | โ Risk |
| Adult Size | 14 in | 2.8 in | โ 5ร 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.
Red Eye Tetra โ Moenkhausia sanctaefilomenae
The Red Eye Tetra is a popular freshwater fish known for its vibrant red eyes and sleek, silver body. They are generally peaceful and can be kept in a community tank with other non-aggressive species. Their moderate activity level makes them suitable for a variety of aquarium setups. With proper care, they can live up to 5 years.
Frequently Asked Questions
Can Oscar live with Red Eye Tetra?
Generally not recommended. Oscar and Red Eye Tetra are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Oscar is aggressive and Red Eye Tetra is semi. 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 Red Eye Tetra together?
A minimum of 100 gallons is recommended for keeping Oscar and Red Eye Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Oscar and Red Eye Tetra?
74โ79ยฐF โ inside Oscar's 74โ81ยฐF and Red Eye Tetra's 72โ79ยฐF.
Is a Oscar aggressive toward a Red Eye Tetra?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Oscar and Red Eye 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. |