This best selling goldfish food has been optimized with the fishkeeper's success in mind. Tetra’s "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. TetraFin® continues 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.