Silver Dollar — Fish Profile
Metynnis argenteus
Quick Specs
| Adult Size: | 6.0" |
| Temperament: | peaceful |
| Care Level: | intermediate |
| Min Tank Size: | 55 gallons |
| Temperature: | 75-82°F |
| pH Range: | 6.0-7.5 |
| Diet: | herbivore |
| Origin: | South America (Amazon Basin) |
| Lifespan: | 5-10 years |
Overview
Silver Dollars are round, disc-shaped fish that look like their namesake coin. They are schooling fish that should be kept in groups of 5+. They will eat live plants, so use artificial plants or tough-leaved species.
Care Guide for Silver Dollar
Tank Setup
Silver Dollar requires a minimum tank size of 55 gallons. Maintain water temperature between 75°F and 82°F, with a pH range of 6.0 to 7.5. A properly sized tank with adequate filtration and regular water changes is essential for long-term health. When housing Silver Dollar with other species, always choose a tank size that accommodates the most demanding fish in the community.
Feeding
Silver Dollar is a herbivore feeder. Provide a varied diet appropriate for herbivore species to ensure optimal health and coloration. Feed small portions 2–3 times daily, and remove uneaten food after a few minutes to maintain water quality.
Temperament & Compatibility
This species is classified as peaceful. Silver Dollar reaches an adult size of 6.0 inches and has a care level of intermediate. Always research compatibility before adding new fish to an established aquarium. Individual temperament can vary, so monitor new introductions closely for the first 48 hours.
Origin & Lifespan
Silver Dollar originates from South America (Amazon Basin) and has an expected lifespan of 5-10 years when kept in proper water conditions with appropriate tank mates and diet.
Compatible Tank Mates
🟢 Good Tank Mates
🟡 Caution Tank Mates
Compatibility Results for Silver Dollar
All 69 compatibility checks involving Silver Dollar:
Recommended for Silver Dollar
Omega One Veggie Rounds — $9.49Herbivore sinking rounds for plant-eating fish
Expert Care Tips for Silver Dollar
- Large tank required: At 55+ gallons, Silver Dollar needs serious equipment investment. Ensure your filter is rated for at least 1.5× the tank volume.
- Warm-water species: Silver Dollar prefers 75–82°F. Use a reliable submersible heater with a thermostat — avoid temperature swings above 2°F per day.
- Adaptable pH range: Silver Dollar accepts pH 6.0–7.5. Most tap water falls within this range, but always test and acclimate slowly.
- Peaceful community fish: Silver Dollar works well in community tanks. Still, avoid housing with fish large enough to eat them — a 6.0" fish is vulnerable to anything with a mouth bigger than 2×.
- Acclimation: Always drip-acclimate Silver Dollar over 30–45 minutes. Match temperature and pH gradually to prevent osmotic shock.