Optimum Tropical Fish is a non-water fouling staple food formula suitable for all types of aquarium fish species, such as Goldfish, Fancy Carp, Swordtails, Platies, Mollies, Angelfish, Cichlids, Anabantids, & Betta. Containing Astaxanthin, a carotenoid pigment that enhances the brilliant natural color of aquarium fish. In addition, the highly available phosphorus helps promotes growth, decrease head & bone deformities & prevent "Plump fish" conformation by reducing fat deposition.