Harlequin Rasbora and Serpae Tetra Compatibility Overview
Harlequin Rasbora and Serpae Tetra can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Harlequin Rasbora is peaceful and Serpae Tetra is semi, so give them room and cover rather than assuming they will ignore each other. A minimum 20-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Harlequin Rasbora | Serpae Tetra | Verdict |
|---|---|---|---|
| Temperature | 72โ81ยฐF | 68โ82ยฐF | โ 72โ81ยฐF |
| pH Range | 5.5โ7.5 | 5.0โ7.5 | โ 5.5โ7.5 |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 1.75 in | 1.6 in | โ Similar |
| Min. Group | 8+ | 10+ | See below |
| Min. Tank Size | 20 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
Harlequin Rasbora โ Trigonostigma heteromorpha
Active mid-level schooling fish with a distinctive black triangular patch. One of the best all-around community tank fish.
โ Full Harlequin Rasbora care guide
Serpae Tetra โ Hyphessobrycon eques
The Serpae Tetra is a popular freshwater fish known for its vibrant coloration and peaceful nature. It is well-suited for community tanks and can be a great addition to any aquarium. With its moderate activity level and easy care requirements, it is a suitable choice for beginners and experienced aquarists alike.
Frequently Asked Questions
Can Harlequin Rasbora live with Serpae Tetra?
Yes, in a well-planned setup. Harlequin Rasbora and Serpae Tetra can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Harlequin Rasbora is peaceful and Serpae Tetra is semi, so give them room and cover rather than assuming they will ignore each other. A minimum 20-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Harlequin Rasbora and Serpae Tetra together?
A minimum of 20 gallons is recommended for keeping Harlequin Rasbora and Serpae Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Harlequin Rasbora and Serpae Tetra?
72โ81ยฐF โ inside Harlequin Rasbora's 72โ81ยฐF and Serpae Tetra's 68โ82ยฐF.
Is a Harlequin Rasbora aggressive toward a Serpae Tetra?
Harlequin Rasbora is peaceful and Serpae Tetra is semi. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Harlequin Rasbora and Serpae Tetra
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 20 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 29 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 55 gal | Best when keeping larger schools or reducing territorial pressure. |