HELP!! my fiddler crab needs you!!

Question

okay, long story short-- i have 2 males and 2 females. while back, one male lost all legs on one side but one. today female molted and i thought it was the male with only one leg bc i saw new legs. well i get home and the shell had all the legs so it had to be the females.. i look for the male and his last leg is gone!! no legs on one side and the newly molted female was gone!! the biggest crab ate her!! =[ i just need to know what i should do about the crab with no legs on one side!! he looks so sad.... =[

.. and i didnt take the biggest crab out so he doesnt bother any more of my crabbies!!

Answer 1

How big is your tank?  If the crabs don't have enough room to themselves there's no way u can really keep them from messing with one another, especially after molts.