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Metynnis argenteus
Care guide, husbandry, breeding, disease, and sourcing intelligence on Silver Dollar - written by the Fast Aquatics editorial team.
Silver Dollar requires a minimum of 75 gallons for healthy adults. The minimum is based on 6 inches adult size and territorial range. Plan a tank sized for adult footprint, HOB or canister filter rated 4-6x volume, dechlorinated water, appropriate temperature heater, and stocking-appropriate hardscape.
The Silver Dollar is rated intermediate difficulty on this care sheet. It needs a tank of at least 75 gallons. Adults reach about 6 inches and live 10 years. Silver Dollar (Metynnis argenteus) is a intermediate-care freshwater species that thrives in tanks of 75 gallons or larger with stable parameters. Best paired with peaceful tankmates of similar size and water-chemistry needs.
Silver Dollar reaches 6 inches at adulthood with a captive lifespan of 10 years with proper care. The minimum is based on 6 inches adult size and territorial range. Plan a tank sized for adult footprint, HOB or canister filter rated 4-6x volume, dechlorinated water, appropriate temperature heater, and stocking-appropriate hardscape.
Silver Dollar is susceptible to standard freshwater diseases (ich, columnaris, fin rot, bacterial infections). Quarantine new Silver Dollar for 4 weeks before adding to display. Silver Dollar prefers freshwater parameters: temperature 74-80°F, pH 6.5-7.5, GH 4-12 dGH, KH 3-8 dKH, ammonia + nitrite 0 ppm, nitrate under 20 ppm. Use dechlorinator on every water change.
Other species in the same category with care profiles on Fast Aquatics. Click any name for the full husbandry breakdown.
Silver Dollar taxonomy and care recommendations cross-checked against the following authoritative references and our internal vendor + breeder database.
Browse the full disease database, calculator collection, aquarium glossary, or Q&A library for additional reference.