The Pincushion Urchin, Lytechinus sp., is round with very short spines growing only to three inches in diameter. A natural camoflaguer, the Pincushion Urchin may carry algae, shells, and rubble on its back. It is an algae grazer that roams the tank at night - it is best kept in a tank with plenty of live rock devoid of puffers and triggers. However beneficial, it is not necessarily reef safe as it can nip on corals. The Pincushion Urchin can be supplementally fed algae or seaweed if there is not enough naturally in the tank. 

Like some other Urchins, the Pincushion Urchin can act as a water quality indicator species. If its spines begin to fall out that is a good sign that your water quality is poor. Overall, this species can thrive in reef tanks if housed with the right tankmates and can be a super beneficial tank member if you have an algae problem.