I just purchased a fire shrimp a few days ago and I now notice he is missing one of his primary claws? Will this grow back? (I know this happens with crabs) Also, he did shed his shell last night, so I am thinking maybe the claw came off with that? I just hope i didn't buy a defective shrimp. (I have only two clown fish in it and a clean up crew so I don't think it was lost in a fight)