Royal Gramma and Swordtail Compatibility Overview
Royal Gramma and Swordtail 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 usable pH overlap is narrow and requires stable, tested water. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Royal Gramma | Swordtail | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 65โ80ยฐF | โ 72โ80ยฐF |
| pH Range | 8.1โ8.4 | 7.0โ8.3 | โ ๏ธ 8.1โ8.3 (narrow) |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 3.0 in | 5 in | โ Similar |
| Min. Group | 1+ | 3+ | See below |
| Min. Tank Size | 55 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
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.
โ Full Royal Gramma care guide
Swordtail โ Xiphophorus hellerii
Hardy livebearer with a distinctive elongated lower tail fin in males. Peaceful community fish that tolerate a wide temperature range.
Frequently Asked Questions
Can Royal Gramma live with Swordtail?
Generally not recommended. Royal Gramma and Swordtail 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 usable pH overlap is narrow and requires stable, tested water. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Royal Gramma and Swordtail together?
A minimum of 55 gallons is recommended for keeping Royal Gramma and Swordtail together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Royal Gramma and Swordtail?
72โ80ยฐF โ inside Royal Gramma's 72โ82ยฐF and Swordtail's 65โ80ยฐF.
Is a Royal Gramma aggressive toward a Swordtail?
Royal Gramma is semi and Swordtail is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Royal Gramma and Swordtail
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 | 125 gal | Best when keeping larger schools or reducing territorial pressure. |