Feeding depends on the type of fish you own. Aside from large predatory fish, most aquarium fish do best when fed only what they can consume in 2 minutes or less, once or twice a day. Any leftover food will pollute the water and stress your fish. Herbivorous (vegetarian) fish need to eat more frequently, but still feed only small amounts per feeding. Many experienced aquarists skip feeding their fish once or twice a week to allow them to clear their digestive systems. Watch our short video on the 3 Tips to Succeed to learn about the key tips we recommend in fishkeeping.