The Red Tuxedo Urchin, Mespilia sp has a round or oval body covered in hundreds of uniformed spines used for protection. A nocturnal scavenger it will spend most of its time during the day hiding in rocks, crevices, or under substrate. Suring the night this urchin will emerge to graze on algae. Tuxedo Urchins are generally a solitary animal but can do well in small groups if the tank is large enough to provide enough algae to eat. Typically a very hardy invertebrate, they are very sensitive to poor water quality and any copper based medications.