What size tank does a Silver Dollar need?

Silver Dollar needs a minimum of 55 gallons, with 75 gallons recommended. They are middle swimmers. Keep in groups of 5+.

Is Silver Dollar good for beginners?

Silver Dollar is rated "intermediate" difficulty (2/5). Great for beginners.

What fish are compatible with Silver Dollar?

Silver Dollar is peaceful. Compatible tank mates include other peaceful fish with similar water parameters (pH 6-7.5, temp 75-82°F).

Silver Dollar

Metynnis argenteus

Family: Serrasalmidae • Origin: South America

Silver Dollars are peaceful, disc-shaped schooling fish related to piranhas. They look incredible in groups but will eat every plant.

Min Tank

55 gal

Max Size

Temperature

75-82°F

6-7.5

Lifespan

10 years

School Size

Swim Level

middle

Hardness

4-15 dGH

peacefulintermediateherbivoreschooling

Is Silver Dollar Right for Your Tank?

Silver Dollar is an excellent choice for beginners — rated "intermediate" difficulty (2/5). They're hardy, forgiving of minor water parameter fluctuations, and generally easy to feed. They need at least 55 gallons — a mid-size tank commitment. Plan your space accordingly.

With a peaceful temperament, Silver Dollar makes a great community fish. They coexist well with other non-aggressive species of similar size. This is a schooling species — keep at least 5 together, or they may become stressed and display abnormal behavior. Expected lifespan: 10 years with proper care.

Common Mistakes with Silver Dollar

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Keeping fewer than 5 together

Silver Dollar is a schooling species — they need a group of at least 5 to feel secure. Lone or paired individuals become stressed, hide constantly, and may develop health issues or aggression.

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Relying on a heater without a thermometer

Silver Dollar needs 75–82°F. Heaters malfunction or drift over time — always use a separate thermometer to verify. Temperature swings of even 3–4°F can trigger stress and disease, particularly ich.

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Putting them in a tank under 55 gallons

Many beginners underestimate tank size needs. Silver Dollar requires at least 55 gallons — ideally 75. Cramped tanks lead to stunted growth, aggression, and poor water quality.