I have 2 Chinese firebellies in a 10 gallon tank. Small Tetra micro-filter, water partially changed twice a week. Gravel and rocks cleaned every 2 weeks. I feed them frozen bloodworms every day. Problem I am having is that one is perfectly healthy while the other is missing a hand. (it wasn't missing the hand a day ago) Is there some precaution I should take to help him heal like give him his own tank for awhile? And why would the other one eat his hand? He seems pretty down and out, and I just want to make him better and not get picked on.
Any advice would be greatly appreciated.

