The Camelback Shrimp is recognizably different from the Peppermint Shrimp, in that it has a hump on its back.  This shrimp isn't a good choice for reef tanks, but can be used to devour AEFW off infected corals, according to one site.  Set up a hospital tank, place six of these shrimp in the tank, and place an infected coral in their midst for exactly 30 minutes, not a minute longer.  The shrimp will pick off the pest flatworms, but if you leave it too long they may start picking off the flesh of the coral next.