I got from a 7000 bird, chicken farm, 6 pullets. About a week after I got them I noticed what appears to be one chickens, although it could be 2 chickens, irregular stool. One seems loose, another bloody. I have given the meds for cocc (whatever it is) and no change. No chicken looks sick, no change in the stools. I see one of each, every morning on their roosting platform. Got any ideas?