Silver Dollar

Metynnis hypsauchen

Silver Dollar (Metynnis hypsauchen) — Easy care, Peaceful, under Other. Minimum tank in the app: 66 US gal min; aim for 75–82°F and pH 6–7.5. The Silver Dollar appeals to aquarists looking for a dynamic, mid-water swimmer that adds visual interest without overwhelming aggression.

Silver Dollar (Metynnis hypsauchen) in a planted freshwater aquarium
Care levelEasy
TemperamentPeaceful
Min tank size66 US gal min
pH range6–7.5
Temperature75–82°F
Max size5.9 in (15.0 cm)
Captive lifespan10–15 years
SchoolingYes · 5+ recommended

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.

Natural distribution

South America

  • South America

Regional colours match the stocking calculator’s origin map.

Silver Dollar Tank Setup

Create a spacious environment with open swimming areas complemented by plenty of plants and decorations to provide security. Ensure strong filtration to maintain water quality, and aim for moderate lighting to reduce stress and encourage natural behaviour.

What Do Silver Dollars Eat?

Silver Dollars are opportunistic feeders and can be competitive during feeding times, so provide varied diets to reduce competition. Consider high-quality pellets, live foods, and vegetables to support their health and enhance their coloration.

Silver Dollar Tank Mates

Ideal companions include larger, non-aggressive species that occupy different swim zones, such as larger tetras or peaceful cichlids. Be cautious with smaller or overly shy species that may become targets of the Silver Dollar's assertive feeding style. Intraspecies interactions are generally harmonious when kept in groups, but overcrowding can lead to stress.

Are Silver Dollars Good for Beginners?

In App-aquatic we file this under easy care. That still means a cycled tank, realistic stocking, and parameters that do not swing every weekend. Aquarists often underestimate the required tank size and filtration, leading to poor water conditions which stress the fish. neglecting to provide adequate swimming space can result in aggression or stunted growth due to limited movement.

Building a community? Run the full list through the stocking calculator before you add anything else.

Log tests and reminders in App-aquatic—free, same data you see here.