Update on crab shell

So yesterday I was in raptures over how cool the crab's old shell looked. I had planned on leaving it there forever!! Well, I got home last night after blogging about it and I ran to the tank to look at it...and guess what? He was eating it!! GROSS!! I'm not sure what I'm more bummed/grossed out about. The fact that the shell is no longer in one piece and looking cool, or the fact that he's eating himself!!! Eww.