This is a large can of Marine Flake Food which I feed my tank ever now and then. I tend to get it when the OSI Spirulina Flake is out of stock. This is fed like any flake food. Pre-mix with some tank water and add to the tank. If you just sprinkle the water surface it tends to go down the overflows before sinking.
All of my fish enjoy this food.
According to the can some of the benefits of OSI Marine Flake are: Balanced Nutrition, Color Enhancing Pigments, Stabilized Vitamin C.