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.