Corydoras and Harlequin Rasbora Compatibility Overview
Corydoras Catfish and Harlequin Rasbora 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 | Corydoras Catfish | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 70โ79ยฐF | 72โ81ยฐF | โ 72โ79ยฐF |
| pH Range | 6.0โ8.0 | 5.5โ7.5 | โ 6.0โ7.5 |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 2.5 in | 1.75 in | โ Similar |
| Min. Group | 6+ | 8+ | See below |
| Min. Tank Size | 20 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
Corydoras Catfish โ Corydoras spp.
Armoured bottom-dwelling catfish that are peaceful with all non-aggressive species. Need fine sand substrate to protect delicate barbels.
โ Full Corydoras Catfish care guide
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.
Frequently Asked Questions
Can Corydoras Catfish live with Harlequin Rasbora?
Yes, in a well-planned setup. Corydoras Catfish and Harlequin Rasbora 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 Corydoras Catfish and Harlequin Rasbora together?
A minimum of 20 gallons is recommended for keeping Corydoras Catfish and Harlequin Rasbora together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Corydoras Catfish and Harlequin Rasbora?
72โ79ยฐF โ inside Corydoras Catfish's 70โ79ยฐF and Harlequin Rasbora's 72โ81ยฐF.
Is a Corydoras Catfish aggressive toward a Harlequin Rasbora?
Corydoras Catfish is peaceful and Harlequin Rasbora is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Corydoras and Harlequin Rasbora
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. |