Hikari Seaweed Extreme is a scientifically developed diet for all types of marine herbivores, such as angel fish and tangs. This food is an ideal supplemental diet for herbivorous marine fish with more than 67% natural seaweed Feed no more than your pet will consume within two minutes, two to three times each day. Hikari Seaweed Extreme absorbs water rapidly and takes on a soft texture similar to wet Nori Algae, making it difficult to remove any uneaten food. For this reason, to avoid over-feeding, we suggest smaller feedings until you find the ideal amount for your mix of fish. Note: Hikari Seaweed Extreme contains higher levels of natural ingredients which may cause a slight change in color from one production lot to another. Rest assured because of our rigid quality standards each package meets our superior nutritional specifications.