We started off with six chickens a year ago, and recently added 8 more to our flock. (6 from one farmer and 2 from another). A few of the new chickens (from the farmer who sold is six) are eating and laying well but have very smelly runny greenish stools. The other two newer ones have very dirty bottoms all the time. We didn't notice any of these symptoms when we first got them. We've had them for a couple of months now and these symptoms just seem to have developed recently. Also, one of our original six hens appears to be very sick. At first i attributed it to molting or being pinned down too often by our roo, but today i noticed she was having difficulty standing (stumbles when she walks) her head is tucked in, her beak is open, and her eyes appear watery and hazed. Any ideas???