The TetraPRO line provides advanced nutrition for healthier fish and clearer water. The exclusive, patented Low-Heat manufacturing process preserves more of the essential nutrients and vitamins that fish need to thrive and grow. TetraPRO Tropical, Tropical Color and Goldfish formulae also include a new Biotin spot crisp. Biotin is a special supplemental ingredient that has been proven to enhance fish health through making their digestion more effective. PRO foods provide our most sophisticated support system for your fish's immune system, including biotin, carnitine, beta glucans, omega 3 fatty acids and a precision blend of vitamins; A, B1, B2, B12, K, C and D3. Advanced Clear Water Formula - Round consistent crisps feed like flakes, yet they float longer so food gets eaten and water stays clear.