Compatibility Overview
Harlequin Rasbora and Platy 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 | Harlequin Rasbora | Platy | Verdict |
|---|---|---|---|
| Temperature | 72–81°F | 65–80°F | ✅ 72–80°F |
| pH Range | 5.5–7.5 | 7.0–8.5 | ⚠️ 7.0–7.5 (narrow) |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 1.75 in | 2.5 in | ✅ Similar |
| Min. Group | 8+ | 3+ | See below |
| Min. Tank Size | 55 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Harlequin Rasbora — Trigonostigma heteromorpha
Active mid-level schooling fish with a distinctive black triangular patch. One of the best all-around community tank fish.
→ Full Harlequin Rasbora care guide
Platy — Xiphophorus maculatus
Hardy livebearers that are among the easiest fish to keep. Peaceful with virtually all community species. Prolific breeders.
Frequently Asked Questions
Can Harlequin Rasbora live with Platy?
Yes, in a well-planned setup. Harlequin Rasbora and Platy 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 Harlequin Rasbora and Platy together?
A minimum of 55 gallons is recommended for keeping Harlequin Rasbora and Platy together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Harlequin Rasbora and Platy?
72–80°F
Is a Harlequin Rasbora aggressive toward a Platy?
Harlequin Rasbora is peaceful and Platy is peaceful. Limited pH overlap (7.0–7.5) — maintain pH carefully within this narrow window.