My Fiddler Crab...what happened and what should I do?

Question

I have a tank with 2 fiddler crabs, 1 red crab, and 2 guppies. One of my fiddler crabs only has one leg as of this morning. It can move around a little, but I have no clue what happened to it. Could this be cannibalism? I'm sure I feed them enough because there is some food debris in the tank. It's really a sorry sight, so do you think I can save it somehow, maybe by putting it in a tank alone? Or do you think it will die soon and I shouldn't bother? What do you think happened and what do you suggest I do?

Answer 1

More than likely he got into a fight with one of the other crabs.  this happens a lot with crabs.  You didn't say how large your tank is but really 3 crabs I am assuming you have a 30 or better?  If not that is the reason they were fighting.