I have a 1 year old belgian d'uccle rooster who isn't looking too well. He is lethargic and standing with his head tucked in. I also just noticed his comb is pale and puffy. I just separated him from his flock and gave him nutridrench, corid, and some vitamin/electrolyte mix. My first thought was coccidia, although no other chickens in his flock have any symptoms and there are a dozen or so younger chicks in there. I'll be treating the whole flock just to be safe, but any other ideas on what I should do or treat for? The puffy comb has me stumped, i've never encountered that.