Molly and Platy Compatibility Overview
Short answer: Yes. Both do well at 72-80°F and both are peaceful. Match the tank size and group size in the table below and both should do well.
Molly and Platy 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 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. Both species are peaceful, 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 — inside Molly's 72–82°F and Platy's 65–80°F.
Is a Molly aggressive toward a Platy?
Molly is peaceful and Platy is peaceful. No major aggression issues are expected between these species.
More Good Tank Mates for Molly and Platy
The highest-scoring compatible partners for each species in our compatibility data.
For Molly
- Guppy — 96/100
- Swordtail — 89/100
- Electric Yellow Cichlid — 88/100
- Peacock Cichlid — 87/100
- Corydoras — 86/100
For Platy
- Mystery Snail — 96/100
- Corydoras — 93/100
- Guppy — 92/100
- Nerite Snail — 91/100
- Zebra Danio — 91/100
Related Compatibility Guides
Tank Size for Molly and Platy
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 55 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 75 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 125 gal | Best when keeping larger schools or reducing territorial pressure. |