Compatibility Overview
Corydoras Catfish and Harlequin Rasbora can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 55-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Corydoras Catfish | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 70–79°F | 72–81°F | ✅ 72–79°F |
| pH Range | 6.0–8.0 | 5.5–7.5 | ✅ 6.0–7.5 |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 2.5 in | 1.75 in | ✅ Similar |
| Min. Group | 6+ | 8+ | See below |
| Min. Tank Size | 55 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Corydoras Catfish — Corydoras spp.
Armoured bottom-dwelling catfish that are peaceful with all non-aggressive species. Need fine sand substrate to protect delicate barbels.
→ Full Corydoras Catfish care guide
Harlequin Rasbora — 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, and neither poses a major aggression risk to the other. A minimum 55-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 55 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?
72–79°F
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.