Harlequin Shrimp - Hymenocera elegans - are gorgeous creatures. I've never owned one myself, but was able to get a good picture of one while visiting a LFS. These shrimp only eat starfish, and will otherwise perish in our tanks. If you choose to own this shrimp, you'll have to buy a starfish or two each month just to keep it well-nourished. There is a chance it will eat the tiny white starfish (Asterina), but since I've got several Serpent starfish already in reef, I'm not willing to buy this particular shrimp to see if that is true. Reef-safe.