I had four one week old chicks that I bought last sunday, and about three days ago I found one of them had died. I had just assumed that it wasn't healthy when I bought it. At first i thought it was the heat so i backed it away from them and made sure they could get out of it. This morning i found two others dead. i found a large rash under both wings on my chick that is still alive so i checked the two dead ones and found nothing. i checked for crusty butt and it doesnt seem to have any problems. it has been making a loud ,high pitched chirp all day. PLEASE HELP!!!!!!