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Natural calcite for all types of marine and reef aquariums. Helps stabilize calcium and alkalinity. Rich in magnesium. Aids in preventing significant pH drops. Enhances the color of marine fish. Grey Coast is a fully natural calcite substrate for all types of marine, reef, and tropical aquariums. Its chemical composition helps stabilize calcium and alkalinity while preventing large pH fluctuations. Unlike competing "wet" gravels, Grey Coast is sold dry: a bag contains 35% more gravel than an equivalent weight of wet gravel.