Silver Dollar

Metynnis argenteus

A shoal of silver dollars glints like a handful of coins. A peaceful piranha relative that prefers salad to meat.

A peaceful freshwater fish that grows to 15 cm, lives in the middle of the tank in groups of 4 or more and needs 24–28 °C, pH 5.5–7.5 and an aquarium of at least 250 L.

Care at a glance

Water

Freshwater

Temperature

24–28 °C (75–82 °F)

pH

5.5–7.5

Adult size

15 cm (5.9 in)

Aquarium

250 L or bigger (66 US gal)

Temperament

Peaceful

Group size

4 or more

Swims

Middle

Diet

Herbivore

Wild home

Amazon & Paraguay basins

Tank mates

Good company: Bala Shark, Black Ghost Knifefish, Clown Loach, Dwarf Neon Rainbowfish, Pearl Gourami, Pictus Catfish, Red-Tailed Black Shark, Rummy-Nose Tetra, Siamese Algae Eater, Zebra Pleco.

Eaten by: Asian Arowana, Motoro Stingray, Ornate Bichir, Oscar, Siamese Tigerfish.

Attacked by: Flowerhorn, Jack Dempsey.

Eats the newborn fry of: Celestial Pearl Danio, Chili Rasbora, Ember Tetra, Pea Puffer.

Colours

• Classic uncommon
• Red Hook rare

The care values are the ones Aquarius uses, based on how these animals live. Tank mates follow the game's rules: water type, temperature and pH, who can swallow whom, fin nipping, temperament and territory.