Otocinclus and Silver Dollar Compatibility Overview
Otocinclus and Silver Dollar 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 75-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Otocinclus | Silver Dollar | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 75โ82ยฐF | โ 75โ82ยฐF |
| pH Range | 6.0โ7.5 | 6.0โ7.0 | โ 6.0โ7.0 |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.5 in | 5.9 in | โ ๏ธ 3.9ร difference |
| Min. Group | 4+ | 5+ | See below |
| Min. Tank Size | 75 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
Otocinclus โ Otocinclus spp.
Tiny algae-eating catfish that are peaceful with all species. Need established algae growth and biofilm; sensitive to ammonia.
โ Full Otocinclus care guide
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 Otocinclus live with Silver Dollar?
Yes, in a well-planned setup. Otocinclus and Silver Dollar 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 75-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Otocinclus and Silver Dollar together?
A minimum of 75 gallons is recommended for keeping Otocinclus and Silver Dollar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Otocinclus and Silver Dollar?
75โ82ยฐF โ inside Otocinclus's 72โ82ยฐF and Silver Dollar's 75โ82ยฐF.
Is a Otocinclus aggressive toward a Silver Dollar?
Otocinclus is peaceful and Silver Dollar is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Otocinclus 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. |