Ocean Nutrition's flake food is adapted from its frozen foods - rich in real seafood, plankton and algae, it's gourmet food for your marine and freshwater fishes! The Prime Reef formula is designed and tested by aquaculturists for omnivorous diets. With high levels of natural marine proteins derived from organisms that normally live in the reef environment, the flavor of Prime Reef is irresistable. Loaded with vitamins, Prime Reef enhances coloration, energy and immune systems. Won't cloud your water and is low in phosphorus and ash.