I put an emerald crab in my tank on Oct. 16th to help with the "new tank" algae problem (he did a bang up job). His body was about the size of a dime and he had these cute little pincher arms. Well.....he molted Friday night and like most people with their first crab, I thought he was dead. I found him (actually, his shell) on the sand bed upside down. It appeared to be a fully intact crab. I went to get the net to fish him out only to realize that he was not dead, but hanging on the rock where I usually see him. I pulled out the old shell and went for my tweezers (I wanted to examine it in detail). I was having a difficult time trying to figure out how he got out of that shell as there seemed to be no cracks in it. I then realized that the top of the shell hinges open and, voila!, the inside was empty. Incredible! I went to the tank to see the new and improved crab. He doubled in size!!! He now has big beefy forearms with spikes. I think I'm going to call him Popeye. Has anyone else had an emerald crab that doubled in size? How did that big body fit in the old, small shell? I would have loved to see the molt in progress.