I have 6 pullets that have been raised together, they are about 5 months old (5-6 eggs per day, great shells). I have one red that has started pecking all the other girls on their back by their tail and leg feathers. At first I noticed one that had really nasty looking feathers and was worried about worms etc. after examining her and feeding and dusting with DE, I now notice they are all looking like her. Except for this one red that is nice and pretty and is pecking them all and pulling feathers out. What to do? I know they have a pecking order and all but she is going to draw blood I am afraid. Is she needing something in her diet? If I remove her will another take her place and do the same thing?