Compatibility Overview
Molly and Tiger Barb 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 | Tiger Barb | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 68–79°F | ✅ 72–79°F |
| pH Range | 7.5–8.5 | 6.0–8.0 | ⚠️ 7.5–8.0 (narrow) |
| Temperament | peaceful | semi | ⚠️ Monitor |
| Adult Size | 4 in | 2.75 in | ✅ Similar |
| Min. Group | 3+ | 6+ | 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.
Tiger Barb — Puntigrus tetrazona
Striking striped barbs that are notorious fin-nippers. Must be kept in groups of 6+ to redirect aggression within the school. Incompatible with long-finned fish.
Frequently Asked Questions
Can Molly live with Tiger Barb?
Yes, in a well-planned setup. Molly and Tiger Barb 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 Tiger Barb together?
A minimum of 55 gallons is recommended for keeping Molly and Tiger Barb together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Molly and Tiger Barb?
72–79°F
Is a Molly aggressive toward a Tiger Barb?
Molly is peaceful and Tiger Barb is semi. Limited pH overlap (7.5–8.0) — maintain pH carefully within this narrow window.