Thx guys, and thank you for moving the thread my apologies for posting in the wrong section, the pic is as good as i can make it. I put it in my tank and he vanished in some hole, I'm sure its there some where if it survives good if not....well sucks for him i guess.
I forgot to ask where the rocks are from ill call up the shop tomorrow and ask, thing that is freaking me out though is that I also saw a crab on one of my rocks and even if I had "washed" the rocks before putting them in I guess this guy was well anchored.
Anyway I just got a glimpse of him before he went back in his hole and its legs were small and with tiger like stripes (yellow and black) I added sand to the tank so I don't know if I sealed him on or not or if he is able to come out. iv been reading alot about the problems so called gorilla crabs do, hope hes not one of them and that the little lobster wont be its first victim....sniff sniff
BTW he was slightly larger than the little lobster