Harlequin Rasbora and Zebra Danio Compatibility Overview
Harlequin Rasbora and Zebra Danio can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Both species are peaceful, and neither poses a major aggression risk to the other. A minimum 20-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Harlequin Rasbora | Zebra Danio | Verdict |
|---|---|---|---|
| Temperature | 72โ81ยฐF | 64โ82ยฐF | โ 72โ81ยฐF |
| pH Range | 5.5โ7.5 | 6.5โ8.0 | โ 6.5โ7.5 |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.75 in | 2 in | โ Similar |
| Min. Group | 8+ | 5+ | 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
Zebra Danio โ Danio rerio
Extremely hardy, fast-moving schooling fish tolerant of a wide temperature range. Active top-to-mid swimmers compatible with most community fish.
Frequently Asked Questions
Can Harlequin Rasbora live with Zebra Danio?
Yes, in a well-planned setup. Harlequin Rasbora and Zebra Danio can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Both species are peaceful, and neither poses a major aggression risk to the 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 Zebra Danio together?
A minimum of 20 gallons is recommended for keeping Harlequin Rasbora and Zebra Danio together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Harlequin Rasbora and Zebra Danio?
72โ81ยฐF โ inside Harlequin Rasbora's 72โ81ยฐF and Zebra Danio's 64โ82ยฐF.
Is a Harlequin Rasbora aggressive toward a Zebra Danio?
Harlequin Rasbora is peaceful and Zebra Danio is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Harlequin Rasbora and Zebra Danio
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. |