It's those type you find in the restaurants..those with thick long feelers but dun have pincers big enough to actually catch fish. Mainly feed on dead stuff and things in your debris. Mine was given to me by a friend as it kept jumping out of his tank. It's still small..about the length of index finger w/o the feelers. Body blue in color..the tail is luminous green (jade-like). Very nice and gentle giant. My harlequin shrimp just chased it away from its precious sea star.