Pin Cushion Urchins, are awesome to see and Urchins are great at consuming algae and are often recommended for GHA outbreaks. Needing a food source, be sure to augment with sinking algae wafers or pellets, Dried Seaweed (Nori), or blanched vegetables such as spinach or zucchini. Photo is representative and colors vary. These are wild caught and come from the southern Florida coast direct from the divers.