Well I as well Emailed Liverocks.com as they probably see them many times a day since they are in the liverock business as well as me getting the LR
from them.. This is the email that came back
Very cool. You have Blue legged pistol shrimp. When they are out (rare) you will see the bright blue legs, an orange body and a white stripe that runs down the lengtht. They typically will live in the sand under a rock and create a hole that will become part of a tunnel system in your sand layer. A very good sand stir creature they will often pair up and mate in the tank environment. You will hear them "pop" when an intruder tries to enter their hole and the pair will defend the opening together. The pop is often mistaken for mantis shrimp and is created in the oversized claw. They are common on our lease sites both in the keys and the Gulf and hopefully you have more than one. Very nice!
Thanks Again Guys And Thanks Kev.. You hit it right on the head AS USUAL