Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
I've kept one in my sump for about 6 months. I feed him silversides. One day I was working on another sump about 10 feet from that sump. I felt something walk acroos my foot. Yep, the crab climbed out of the sump and was walking my floors. He grew from an inch to 6 inches in 6 months.
Congrats on the new house.
I don't have an extra transformer, but you can borrow mine for a few days to check and make sure it's your transformer and not the pump hanging up.
The differance in your crab and the mithrax is the claws, like Jeff said.
The mithrax has flat spots on the ends of their claws and predators don't. Remove him to the sump.