Black Ruby Barb and Royal Gramma Compatibility Overview
Black Ruby Barb 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: Black Ruby Barb wants 5.5โ7.5 and Royal Gramma wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Black Ruby Barb | Royal Gramma | Verdict |
|---|---|---|---|
| Temperature | 68โ81ยฐF | 72โ82ยฐF | โ 72โ81ยฐF |
| pH Range | 5.5โ7.5 | 8.1โ8.4 | โ No overlap |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 2.2 in | 3.0 in | โ Similar |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 20 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Black Ruby Barb โ Pethia nigrofasciata
The Black Ruby Barb is a vibrant, active species suitable for beginners. It requires a spacious tank and a school of its own kind to thrive. Its striking colors and lively nature make it a popular choice.
โ Full Black Ruby Barb 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 Black Ruby Barb live with Royal Gramma?
Generally not recommended. Black Ruby Barb 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: Black Ruby Barb wants 5.5โ7.5 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 Black Ruby Barb and Royal Gramma together?
A minimum of 20 gallons is recommended for keeping Black Ruby Barb and Royal Gramma together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Black Ruby Barb and Royal Gramma?
72โ81ยฐF โ inside Black Ruby Barb's 68โ81ยฐF and Royal Gramma's 72โ82ยฐF.
Is a Black Ruby Barb aggressive toward a Royal Gramma?
Black Ruby Barb is peaceful and Royal Gramma is semi. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Black Ruby Barb 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 | 30 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 55 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 75 gal | Best when keeping larger schools or reducing territorial pressure. |