Compatibility Overview
Molly 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 | Molly | Platy | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 65–80°F | ✅ 72–80°F |
| pH Range | 7.5–8.5 | 7.0–8.5 | ✅ 7.5–8.5 |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 4 in | 2.5 in | ✅ Similar |
| Min. Group | 3+ | 3+ | See below |
| Min. Tank Size | 55 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Molly — Poecilia sphenops
Hardy livebearers that prefer alkaline, hard water — sometimes slightly brackish. Prolific breeders; peaceful community fish.
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 Molly live with Platy?
Yes, in a well-planned setup. Molly 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 Molly and Platy together?
A minimum of 55 gallons is recommended for keeping Molly and Platy together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Molly and Platy?
72–80°F
Is a Molly aggressive toward a Platy?
Molly is peaceful and Platy is peaceful. No major aggression issues are expected between these species.