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Natural zooplankton is an important source of energy and nutrients for stony corals and other plankton filter feeders. PRO-CORAL ZOOTON is a well-balanced plankton replacement for stony corals, specifically, small-polyped stony corals and other plankton filter feeders in a saltwater aquarium. It consists mainly of selected marine ingredients rich in trace elements and minerals. Spirulina is carotenoid-packed and if combined with brewer’s yeast will provide the natural B vitamin requirements and, in particular, vitamin B 12.