The toadstool is 4 wide inches at the top. He doesn't seem to mind, but I just moved hi a little higher in the tank a couple days ago. I had to trim some rocks away from his foot to get him into his permanent location, so I didn't want him to have any more stress. Just to be safe, if put the hermit crab in the penalty box for now (siphon box). He can do some cleanup in there for a while.
Thanks for the replies
Jim