The brown short spine sea urchin, Echinometra virides, is a common, offshore sea urchin found in the Florida Keys and throughout much
of the Caribbean. In an aquarium it will constantly graze algae from your rocks and the walls of your tank. It’s non-aggressive,
and will not eat your corals or other non-mobile invertebrates. Average test size is 1 inch in diameter, but it can grow up to about 2″ in diameter.