Oscar and Royal Gramma Compatibility Overview
Oscar and Royal Gramma are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Oscar | Royal Gramma | Verdict |
|---|---|---|---|
| Temperature | 74โ81ยฐF | 72โ82ยฐF | โ 74โ81ยฐF |
| pH Range | 6.0โ8.0 | 8.1โ8.4 | โ No overlap |
| Temperament | aggressive | semi | โ Risk |
| Adult Size | 14 in | 3.0 in | โ 5ร difference |
| Min. Group | 1+ | 1+ | 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.
Royal Gramma โ Gramma loreto
The Royal Gramma, known for its vibrant blue coloration, is a popular saltwater fish among beginners and experienced aquarists alike. It requires a well-maintained tank with plenty of swimming space and a moderate current. With a peaceful temperament and a relatively easy care routine, the Royal Gramma can be a great addition to a community tank.
Frequently Asked Questions
Can Oscar live with Royal Gramma?
Generally not recommended. Oscar and Royal Gramma are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. 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 Oscar and Royal Gramma together?
A minimum of 100 gallons is recommended for keeping Oscar and Royal Gramma together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Oscar and Royal Gramma?
74โ81ยฐF โ inside Oscar's 74โ81ยฐF and Royal Gramma's 72โ82ยฐF.
Is a Oscar aggressive toward a Royal Gramma?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Oscar and Royal Gramma
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 | 180 gal | Best when keeping larger schools or reducing territorial pressure. |