Anyone have experience with these guys? I've known he was in the tank and never noticed anything out of the ordinary until two small zoa colonies got chomped on his side of the tank. Finally caught him slipping this afternoon.
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This is a ruby red crab (Teleophrys ruber). Like its cousin, the emerald crab (Mithraculus sculptus), both are popular in the hobby as nuisance algae-eaters, although many have observed them harming coral and other invertebrates. See if a fellow hobbyist or aquarium store might want it in spite of this.