The Spider Decorator Crab, Camposcia retusa, is a slow-moving scavenger that curiously attaches various anemones, sea flora, sponges, bryozoans, and coral polyps to its exoskelton in an attempt to camouflage itself. They are semi-aggressive and can harm smaller crabs or snails. Though generally stationary, it will move to eat and breed. The Decorator Crab is easy to maintain and thrives best in well-established fowlr tanks with a thick sandy bottom.