While your koi will feed on bugs, plants, and algae, they can get sick or die if underfed. Feed pond fish about once per day or every other day. Eventually, your beautiful koi will even meet you at the top to provide free, meal-time entertainment. Some folks install koi food feeders for automatic, daily meals or vacation feeding. Shop Play It Koi to stock up on competitively priced koi pellets, goldfish flakes, fish foods and koi foods for various seasons and stages in fish growth.