Silver dollar fish, also known as Metynnis argenteus, are popular freshwater aquarium fish that belong to the characin family (Characidae). They are named for their round, disc-like shape, which resembles a silver dollar coin.
Silver dollar fish have a distinctive shape with a laterally compressed body and a round, disc-like profile. They are characterized by their silver coloration, which gives them their name. They have large eyes and a forked tail fin.
These fish can grow up to 6 inches (15 cm) in length, although some specimens may reach slightly larger sizes. When young, silver dollar fish are usually smaller and have a more elongated shape, but as they mature, they develop the characteristic round shape.
Silver dollar fish are native to the rivers and streams of South America, primarily the Amazon basin. They prefer well-maintained aquariums with clean, slightly acidic to neutral water conditions. The ideal temperature range for these fish is around 75-82°F (24-28°C), and they appreciate a well-filtered tank with moderate water flow.
Species compatibility
Silver dollar fish are generally peaceful and sociable, making them suitable for community aquariums. However, they may nip at the fins of slow-moving or long-finned fish, so it’s best to keep them with similarly sized and active species. They tend to form shoals, so it’s recommended to keep them in groups of at least five or more.
How to feed this species?
In their natural habitat, silver dollar fish are omnivorous, feeding on a variety of plant matter, insects, and small crustaceans. In an aquarium, they can be fed a balanced diet consisting of high-quality flakes, pellets, and occasional live or frozen foods like brine shrimp, bloodworms, or vegetable matter. Providing a varied diet is beneficial for their health and coloration.
Tank Setup
Silver dollar fish require a spacious tank due to their adult size and active nature. A minimum tank size of 55 gallons (208 liters) is recommended for a small group of these fish. The aquarium should be well-planted with some open swimming space in the center. It’s advisable to use soft, sandy substrate and provide ample hiding places with driftwood, rocks, and plants.