I have collected these personally from the Florida Keys and they are prevelant in some of my aquariums containing fish. There has never been an issue of toxic releases or fish suffering death from a distasteful nibble. They are excellant diatom and other nuisance algae. Large numbers of protruding, hooked anchor ossicles in the body wall give the animal the ability to adhere to surfaces in a manner similar to Velcro. Individuals feel sticky and are often found clinging to the neoprene surfaces of wet suits and dive booties after wading or snorkeling through a seagrass bed. Most of the crrent stock is about 1"-1.5" long.