The best food for fish depends on the type of fish you have. Generally, it's best to feed your fish a combination of commercial fish food pellets, flakes, and/or frozen food. You can also give them live food like brine shrimp, bloodworms, and daphnia to supplement their diet. Avoid overfeeding and make sure to research the specific needs of your fish before deciding what to feed them.

Most fish do not need to be fed daily, but rather three to four times a week. However, it is important to determine the specific needs of your fish before deciding how often to feed them. Younger fish may need to be fed more often than adults, for instance, and some species may require more frequent meals due to their high metabolism.

Fish eat a variety of foods, depending on the type. Common foods include plankton, plants, insects, other small fish, worms, crustaceans, and mollusks.