FINALLY - I got the dirty little bugger! Unfortunately he was dead (well fortunately at the same time) he is about 1-1/2" long - Here is his mug shot - I tried to get one closer but the camera just got blurry - if you zoom in on him though you can see his "hammers"
Thanks to everyone for all of your suggestions!
Oh and what I finally had to do was I put the rock in a freshwater dip - that still didn't work so I broke the rock open with a hammer and chisel - Hubby loved that part!
AND OMG worm infestation - anyone suggest a fish that likes worms?
Thanks again!
Liz