Reef Builders - The Source for Reef Keeping Information

Im Completly baffled and am feeling soooooooooo sorry for my beautiful anemone crab.
I thought he was dead after i saw a whole crab lying on a rock which included both claws and both duster like appendages, but after a few hours my girlfriend noticed that he was hiding under a rock, he was definatly alive but had only six legs and nothing else!
Ive done as much research as i can on the net but non i have read have seen their crab loosing 'both' their claws let alone both their 'dusters'....

Turbo