Here's a photo with it retracted, its from August when it first went in the tank. I need an updated one to see if the shell has grown, but this shows what I'm talking about a bit better.
I've done some reading now that I know what this guy is and I'm not going to frag him. I'm going to have to move some things around in the tank and will place him in the sand. Bf says need a bigger tank.....sweet!