I just saw one of my crabs molt! Weird experience.
He was being pushed along the bottom of the tank by the waterflow, without his shell, shaking off his molt. Then he walked away and it was stuck to him, so he shook it off.
Then I was worried because there weren't any spare shells near him, just right at the other side of the tank. But, he started walking towards the shell and everytime he got near, he'd get blown back - obviously he's not very stable without his shell! But, he made one last attempt and ran to the shell, fighting off the current, and popped inside.
His body was a lot longer than I thought it'd be - and curled up beneath him most of the time. I've never seen a hermit like that before - very interesting!
Just thought I'd share this with everyone...at least now I do know what a molt and the real thing looks like :P