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The Zoo Med Giant size Plankton Banquet Block is a time-release feeding block that will feed approximately 15-20 average sized aquarium fish for 10-14 days. In addition to weekend and vacation feeding, Plankton Banquet Blocks are very useful as a daily feeder for problem eaters such as Plecostomus, Algae Eaters, Redtail Sharks, Black Sharks, Gouramis, Saltwater Tangs, Angels, and Damsels. They are also very useful for small fry which do best when constantly feeding. The blue color in this block is pure spirulina. Spirulina is a blue-green plankton, rich in raw protein and major vitamins. Research has shown that freshwater and saltwater fish exhibit superior growth, maturity, energetic behavior, and more elegant coloring when fed spirulina. Made in the U.S.A.