Harlequin Rasbora and Pea Puffer Compatibility Overview
Harlequin Rasbora and Pea Puffer can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Harlequin Rasbora is peaceful and Pea Puffer 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 | Pea Puffer | Verdict |
|---|---|---|---|
| Temperature | 72โ81ยฐF | 74โ82ยฐF | โ 74โ81ยฐF |
| pH Range | 5.5โ7.5 | 7.0โ8.0 | โ ๏ธ 7.0โ7.5 (narrow) |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 1.75 in | 1 in | โ Similar |
| Min. Group | 8+ | 1+ | 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
Pea Puffer โ Carinotetraodon travancoricus
World's smallest pufferfish โ intensely territorial and nippy despite tiny size. Will attack fins and eat shrimp and snails.
Frequently Asked Questions
Can Harlequin Rasbora live with Pea Puffer?
Yes, in a well-planned setup. Harlequin Rasbora and Pea Puffer can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Harlequin Rasbora is peaceful and Pea Puffer 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 Pea Puffer together?
A minimum of 20 gallons is recommended for keeping Harlequin Rasbora and Pea Puffer together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Harlequin Rasbora and Pea Puffer?
74โ81ยฐF โ inside Harlequin Rasbora's 72โ81ยฐF and Pea Puffer's 74โ82ยฐF.
Is a Harlequin Rasbora aggressive toward a Pea Puffer?
Harlequin Rasbora is peaceful and Pea Puffer is semi. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Harlequin Rasbora and Pea Puffer
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. |