This best selling goldfish food has been optimized with the fishkeeper success in mind. "Clean & Clear Water Formula" means that the flakes are even easier to digest and do not leach color, thereby keeping aquarium water clean and clear. Tetra GoldFish Flakes continue to be made with patented, health-enhancing ProCare. This precise blend of immunostimulants, vitamins, biotin, and Omega-3 fatty acids is custom designed to strengthen fish's resistance to disease and stress.