Congo Tetra and Royal Gramma Compatibility Overview
Congo Tetra 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: Congo Tetra wants 6.0โ7.5 and Royal Gramma wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Congo Tetra | Royal Gramma | Verdict |
|---|---|---|---|
| Temperature | 73โ82ยฐF | 72โ82ยฐF | โ 73โ82ยฐF |
| pH Range | 6.0โ7.5 | 8.1โ8.4 | โ No overlap |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 3.1 in | 3.0 in | โ Similar |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 55 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Congo Tetra โ Phenacogrammus interruptus
The Congo Tetra is a vibrant and active fish that thrives in a well-maintained freshwater aquarium. With its striking coloration and peaceful nature, it's a great addition to any community tank. This species is best kept in groups and requires a spacious tank with plenty of swimming space.
โ Full Congo Tetra 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 Congo Tetra live with Royal Gramma?
Generally not recommended. Congo Tetra 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: Congo Tetra wants 6.0โ7.5 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 Congo Tetra and Royal Gramma together?
A minimum of 55 gallons is recommended for keeping Congo Tetra and Royal Gramma together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Congo Tetra and Royal Gramma?
73โ82ยฐF โ inside Congo Tetra's 73โ82ยฐF and Royal Gramma's 72โ82ยฐF.
Is a Congo Tetra aggressive toward a Royal Gramma?
Congo Tetra is peaceful and Royal Gramma is semi. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Congo Tetra 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 | 125 gal | Best when keeping larger schools or reducing territorial pressure. |