You need 4sf per bird in the coop and atleast 9sf in the run per bird and you shouldnt have a problem. How old are the chickens? Once the other chickens see blood or red they will keep going at it until it dies, so seperating it is good. As other have said there will be some chickens at the bottem of the pecking order and they will get "beat up" more often.
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A banana plant in the autumn gale -
I listen to the dripping of rain
Into a basin at night.
~ Basho Matsuo (1644- 1694)
