Compatibility Overview
Molly and Zebra Danio 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 | Zebra Danio | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 64–82°F | ✅ 72–82°F |
| pH Range | 7.5–8.5 | 6.5–8.0 | ⚠️ 7.5–8.0 (narrow) |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 4 in | 2 in | ⚠️ 2.0× difference |
| Min. Group | 3+ | 5+ | 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.
Zebra Danio — Danio rerio
Extremely hardy, fast-moving schooling fish tolerant of a wide temperature range. Active top-to-mid swimmers compatible with most community fish.
Frequently Asked Questions
Can Molly live with Zebra Danio?
Yes, in a well-planned setup. Molly and Zebra Danio 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 Zebra Danio together?
A minimum of 55 gallons is recommended for keeping Molly and Zebra Danio together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Molly and Zebra Danio?
72–82°F
Is a Molly aggressive toward a Zebra Danio?
Molly is peaceful and Zebra Danio is peaceful. Limited pH overlap (7.5–8.0) — maintain pH carefully within this narrow window.