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Pellets exist for larger fish like goldfish and cichlids.
Wafers are for bottom feeders like many catfish. To be sure that the fish get proper nutrition, provide a number of different types and kinds of food. They get many kinds of flakes and freeze dried foods. Sometimes, I feed newborn live brine shrimp, adult brine shrimp, and frozen foods. I rotate about six kinds of foods for the goldfish including various goldfish flakes and pellets.