Yep.
It's all on one rock on one side of the tank.
I keep that rock by itself. It has a few other small specimens, but I get rid of them if they get very big. They don't seem to be able to span the length of the tank to the rock pile on the other side. Once they hit the sand that's it. It's fun to watch it eat. As for the worms I love them. My sandbed is spotless.