Rainbow Shark and Royal Gramma Compatibility Overview
Rainbow Shark 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. Their pH ranges do not meet: Rainbow Shark wants 6.5โ7.5 and Royal Gramma wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Rainbow Shark | Royal Gramma | Verdict |
|---|---|---|---|
| Temperature | 72โ79ยฐF | 72โ82ยฐF | โ 72โ79ยฐF |
| pH Range | 6.5โ7.5 | 8.1โ8.4 | โ No overlap |
| Temperament | semi | semi | โ ๏ธ Monitor |
| Adult Size | 6 in | 3.0 in | โ ๏ธ 2.0ร difference |
| Min. Group | 1+ | 1+ | See below |
| Min. Tank Size | 55 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Rainbow Shark โ Epalzeorhynchos frenatum
Active bottom dweller that becomes territorial at maturity. One per tank; avoid other shark-like or bottom-dwelling species.
โ Full Rainbow Shark care guide
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 Rainbow Shark live with Royal Gramma?
Generally not recommended. Rainbow Shark 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. Their pH ranges do not meet: Rainbow Shark wants 6.5โ7.5 and Royal Gramma wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Rainbow Shark and Royal Gramma together?
A minimum of 55 gallons is recommended for keeping Rainbow Shark and Royal Gramma together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Rainbow Shark and Royal Gramma?
72โ79ยฐF โ inside Rainbow Shark's 72โ79ยฐF and Royal Gramma's 72โ82ยฐF.
Is a Rainbow Shark aggressive toward a Royal Gramma?
Rainbow Shark is semi and Royal Gramma is semi. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Rainbow Shark 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 | 55 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 75 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 100 gal | Best when keeping larger schools or reducing territorial pressure. |