Tetra TetraPro Tropical Crisps with Biotin for Fishes TROPICAL FORMULATION: TetraPro Tropical Crisps provide advanced nutrition for the discerning tropical fish-keeper. OPTIMAL HEALTH: Made with exclusive low-heat process that preserves essential vitamins and nutrients  enhanced with biotin to support fishs immune system. COLOR ENHANCING: High content of natural color enhancers promote the development of rich, beautiful coloration in tropical fish. CLEAR-WATER FORMULA: Easy-to-digest formula helps fish metabolize food more efficiently, reducing waste in the aquarium. FLOATING FOOD: Fish have longer to eat, so more food gets eaten and the water stays clear.