I'm new to the chicken world. Built a 4 x 14 coop with a 10 x 10 run attached to it, have 15 hens and 2 Roos. My girls are as follows: 3 black sexlinks, 2 red sexlinks, 4 americaunas, 1 new hampshire, 1 speckled sussex, 1 delaware, 1 golden comet, 1 barred rock, and 1 cookoo maran. My roos are an easter egger and a buff orpington. My buff orpington in probably 2.5 to 3 yrs old and was bought about a month ago (with 4 others) at a local auction. He was with 14 buff orpington hens and they all looking heathy. I bought him because he was so studly and striking in appearance. All went well until about 4 days ago when he started getting lethargic and acting like he had lost all energy. He either lays around a on the ground sleeping, or sleeps on the roost bars in the coop and doesn't seemed to be eating much. No nasal discharge, but was sneezing for about 3 days before the sleeping set in. I had purchased 4 other hens at the same auction and one of them got sick and died, but she had nasal discharge and congestion and had lost an eye from being pecked by the other chickens. ...Everyone else is healthy. Any thoughts?