A silver dollar fish needs a suitably large, clean tank and a mainly vegetarian diet. Because silver dollars are natural schooling fish, it is best to keep three or four of them together. They are peaceful fish that can safely be kept with larger fish of other species.
Silver dollar fish grow up to 6 inches in length. A single silver dollar fish can be kept in a 10-gallon tank, but a school of three or four fish need a tank of at least 75 gallons. A cover is important as silver dollars have a tendency to jump. The aquarium needs subtle lighting, dark substrate, driftwood and rocks for hiding places, and open spaces for swimming. Decorative plants need to be plastic because silver dollar fish eat live plants. Maintaining a high oxygen level, good filtration and water flow are important. Silver dollar fish feed on vegetable flakes of watercress and lettuce as well as fresh cooked spinach, peas and squash. Occasionally, they enjoy treats of bloodworms, brine shrimp and mosquito larvae.
The easiest way to breed silver dollar fish is to raise several of them together. Though silver dollars do not eat their own eggs, other species of fish do, so it is best to place them in a separate tank before breeding. When a pair spawns, the female lays up to 2,000 eggs, which settle to the bottom and hatch in 3 days. Within a week, the fries swim freely and are able to eat special fry food.