Goldfish and Silver Dollar Compatibility Overview
Short answer: No. Goldfish needs 50-74°F and Silver Dollar needs 75-82°F. Keep them in separate tanks, or pick one of the safer tank mates listed below.
Goldfish and Silver Dollar are generally not recommended to be housed together. Goldfish is a cool-water fish and Silver Dollar is tropical, so the usable temperature range decides this pairing. There is no shared temperature: Goldfish needs 50–74°F and Silver Dollar needs 75–82°F. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Goldfish | Silver Dollar | Verdict |
|---|---|---|---|
| Temperature | 50–74°F | 75–82°F | ❌ No overlap |
| pH Range | 6.5–8.0 | 6.0–7.0 | ⚠️ 6.5–7.0 (narrow) |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 12 in | 5.9 in | ⚠️ 2.0× difference |
| Min. Group | 1+ | 5+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Goldfish — Carassius auratus
Classic pond and aquarium fish that prefer cool water. Heavy waste producers that require robust filtration. Will eat small fish and shrimp.
Silver Dollar — 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 Goldfish live with Silver Dollar?
Generally not recommended. Goldfish and Silver Dollar are generally not recommended to be housed together. Goldfish is a cool-water fish and Silver Dollar is tropical, so the usable temperature range decides this pairing. There is no shared temperature: Goldfish needs 50–74°F and Silver Dollar needs 75–82°F. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Goldfish and Silver Dollar together?
A minimum of 100 gallons is recommended for keeping Goldfish and Silver Dollar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Goldfish and Silver Dollar?
There is no safe shared range: Goldfish needs 50–74°F and Silver Dollar needs 75–82°F.
Is a Goldfish aggressive toward a Silver Dollar?
Goldfish is peaceful and Silver Dollar is peaceful. No major aggression issues are expected between these species.
Safer Tank Mates for Goldfish and Silver Dollar
The highest-scoring compatible partners for each species in our compatibility data.
For Goldfish
- Weather Loach — 98/100
- Bristlenose Pleco — 87/100
- Denison Barb — 87/100
- Koi — 86/100
- Swordtail — 79/100
For Silver Dollar
- Kuhli Loach — 98/100
- Congo Tetra — 96/100
- Keyhole Cichlid — 96/100
- Moonlight Gourami — 93/100
- African Butterfly Fish — 92/100
Related Compatibility Guides
Tank Size for Goldfish 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 | 100 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 150 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 220 gal | Best when keeping larger schools or reducing territorial pressure. |