Molly and Silver Dollar Compatibility Overview
Molly and Silver Dollar can potentially coexist, but the combination requires careful attention. Their pH ranges do not meet: Molly wants 7.5โ8.5 and Silver Dollar wants 6.0โ7.0. A larger tank (minimum 75 gallons), dense planting, and close monitoring are essential.
| Factor | Molly | Silver Dollar | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 75โ82ยฐF | โ 75โ82ยฐF |
| pH Range | 7.5โ8.5 | 6.0โ7.0 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 4 in | 5.9 in | โ Similar |
| Min. Group | 3+ | 5+ | 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.
Silver Dollar โ Metynnis argenteus
The Metynnis argenteus, known as the Silver Dollar fish, is a popular freshwater species with a distinctive silver color and disc-shaped body. They require a spacious tank and are best kept in groups to prevent bullying. Their peaceful nature makes them suitable for community tanks, but they are not known to school.
Frequently Asked Questions
Can Molly live with Silver Dollar?
With significant caution and a larger tank. Molly and Silver Dollar can potentially coexist, but the combination requires careful attention. Their pH ranges do not meet: Molly wants 7.5โ8.5 and Silver Dollar wants 6.0โ7.0. A larger tank (minimum 75 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Molly and Silver Dollar together?
A minimum of 75 gallons is recommended for keeping Molly and Silver Dollar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Molly and Silver Dollar?
75โ82ยฐF โ inside Molly's 72โ82ยฐF and Silver Dollar's 75โ82ยฐF.
Is a Molly aggressive toward a Silver Dollar?
Molly is peaceful and Silver Dollar is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Molly and Silver Dollar
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. |