Feeding Your Fish Tips: Do not overfeed your fish. Try for two small feedings per day instead of one large feeding. Give your fish a small pinch of food and see if they eat it all within a minute or two. If you see flakes floating to the bottom of the tank, then you put in too much food. That is, unless you have bottom feeders. Overfeeding will lead to poor aquarium water quality and will increase the stress levels in your fish.
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The silver dollar (Metynnis argenteus) is a tropical fish belonging to the Characidae family which is closely related to piranha and pacú. Originating in the Tapajós River basin in South America, this somewhat round-shaped silver fish with slight red-tinged anal fin is mostly found in tanks kept by fish-keeping hobbyists. It will grow to a maximum length of 14 centimeters (5.5 inches).
Silver dollars natively live in a tropical climate in the sides of weedy rivers. They prefer water with a pH of 5–7, a water hardness of up to 15 dGH, and an ideal temperature range of 24–28 °C (75–82 °F). Their diet is almost exclusively vegetarian and in captivity they will often eat all the plants in a tank. They will also eat worms and small insects.
The silver dollar is listed as semi-aggressive but it is very mellow like the pacu. These fish can be kept in community tanks with fish that can’t fit in their mouths, so don’t put a full-grown silver dollar with neon tetras and guppies. These fish can also be kept with larger fish like oscars, pikes, and larger catfish when full grown.
Hard Bellies are silvery and somewhat transparent; they are the most commonly encountered species.