Harlequin Shrimp, Hymenocera elegans.

The Harlequin Shrimp have a white body with large light blue spots, and the males are slightly smaller than the female. It differs from its close cousin, the HawaiianH. picta which has purple and red spots. It has large claws (chelipeds) which are for show only; it does not use them for hunting.

It is very particular about what it will eat, dining only on echinoderms, primarily starfish, and a few urchin species. It will eat starfish (Linckia, Fromia sp.) by starting at the tip
of the arm and working its way to the central disc. The starfish may shed the arm, but is often mortally wounded.

As its primary source of food, you will need to supply the Harlequin Shrimp with starfish,  in the home aquarium they are used to help rid and control tanks of nuisance asternia starfish.