Molly and Rosy Barb Compatibility Overview
Molly and Rosy Barb can potentially coexist, but the combination requires careful attention. Their preferred temperature ranges have little safe overlap. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. A larger tank (minimum 75 gallons), dense planting, and close monitoring are essential.
| Factor | Molly | Rosy Barb | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 61โ75ยฐF | โ ๏ธ 72โ75ยฐF (narrow) |
| pH Range | 7.5โ8.5 | 6.0โ8.0 | โ ๏ธ 7.5โ8.0 (narrow) |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 4 in | 3.9 in | โ Similar |
| Min. Group | 3+ | 8+ | See below |
| Min. Tank Size | 75 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
Molly โ Poecilia sphenops
Hardy livebearers that prefer alkaline, hard water โ sometimes slightly brackish. Prolific breeders; peaceful community fish.
Rosy Barb โ Pethia conchonius
The Rosy Barb is a popular freshwater fish known for its vibrant coloration and peaceful nature. It is well-suited for community tanks with other non-aggressive species. They require a well-maintained environment and can be sensitive to water quality fluctuations. With proper care, they can thrive and add a splash of color to your aquarium.
Frequently Asked Questions
Can Molly live with Rosy Barb?
With significant caution and a larger tank. Molly and Rosy Barb can potentially coexist, but the combination requires careful attention. Their preferred temperature ranges have little safe overlap. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. A larger tank (minimum 75 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Molly and Rosy Barb together?
A minimum of 75 gallons is recommended for keeping Molly and Rosy Barb together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Molly and Rosy Barb?
72โ75ยฐF (narrow) โ inside Molly's 72โ82ยฐF and Rosy Barb's 61โ75ยฐF.
Is a Molly aggressive toward a Rosy Barb?
Molly is peaceful and Rosy Barb is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Molly and Rosy Barb
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 75 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 125 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 150 gal | Best when keeping larger schools or reducing territorial pressure. |