O.S.I. Spirulina Flakes are not only an excellent natural color enhancer, but the algae spirulina also stimulates your fish's immune system to attack gram-negative bacteria. Gram-negative bacteria are known to cause a variety of diseases in fish. The result of feeding O.S.I. Spirulina Flakes is healthier, heartier and more vibrant fish. This diet is appropriate for all freshwater and marine fish. (This diet is especially important for marine fishes which tend to be more delicate and disease prone).CONTENT ANALYSIS: Crude Protine (min) 41%, Crude Fat (min) 4%, Crude Fiber (max) 6%, Moisture (max) 8%.