Hi there, I'm new to BYC. I have had chickens for quite some time, but i've never had the issues I do now. I have chickens dying off like it's their job. I introduced some new chicks to the coop and since them, i've had difficulties. My chickens are loosing weight. Their stool is a brown/tan color, no blood, loose but not runny. I had a couple with nasty eyes. A bunch of them go lame about a week before they die. I hear a couple sneezes here and there, occasional coughs, no wheezing though, egg production slowed down a tiny bit, but is back to norm. I have all ages of birds dying, and it's really upsetting. I mainly have americanas, for eggs for the family, a couple OEG bantams, and some mixed birds. Please help. I did a treatment of doxycycline when birds first started getting sick, no luck though. I've read tons of disease symptoms, but Idk what to do. I was almost half tempted to kill everything, clean everything, and start over. I read that depending on the disease, birds will be carriers, and could transmit to other birds, and that is definately something I don't want. Fresh water is given daily, and they are on a mini layer pellet from Rowe feed.