Compatibility Overview
Angelfish 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 75-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Angelfish | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 74–84°F | 72–81°F | ✅ 74–81°F |
| pH Range | 6.0–7.5 | 5.5–7.5 | ✅ 6.0–7.5 |
| Temperament | semi | peaceful | ⚠️ Monitor |
| Adult Size | 6 in | 1.75 in | ⚠️ 3.4× difference |
| Min. Group | 1+ | 8+ | See below |
| Min. Tank Size | 75 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Angelfish — Pterophyllum scalare
Elegant South American cichlids with long flowing fins. Generally peaceful but territorial when breeding and will eat very small fish.
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 Angelfish live with Harlequin Rasbora?
Yes, in a well-planned setup. Angelfish 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 75-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Angelfish and Harlequin Rasbora together?
A minimum of 75 gallons is recommended for keeping Angelfish and Harlequin Rasbora together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Angelfish and Harlequin Rasbora?
74–81°F
Is a Angelfish aggressive toward a Harlequin Rasbora?
Angelfish is semi and Harlequin Rasbora is peaceful. Minor aggression possible from the semi-aggressive species; provide hiding spots.