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color of sponge will vary
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The Sponge Crab can grow up to 3 inches. They are not considered reef safe as they may pull some corals and small inverts to use for decorating their shells. The crabs, as their name suggests will take parts of sponges, shells, and rock to put on their body for camouflage. They like to hunt at night. Their diet consists of meaty foods like clams and small chopped up fish.