The Halloween Urchin is a hairy pincushion urchin that has orange spines and a bluish black base. It is a great addition to a cleanup crew and will eat leftover uneaten food, detritus, and algae including undesired filamentous algae. The Halloween Urchin has hairy sticky filaments all over its body as well as spines. Their sticky filaments allow them to camouflage themselves by covering itself with rocks, algae, sponges, and shells. If there is not enough algae for the Halloween urchin to graze on they should be fed supplements of dried seaweed.