I have begun a 5 day Corid treatment for all of my chickens. Some had started showing signs of illness. After talking to a friend of mine who also has chickens, he said he treats his chickens for cocci. So I thought that's probably something I should do. After closer examination of my chickens, it seems to be more of a respiratory illness. They are lethargic with watery eyes and nostrils, sneeze and labored gurgly breathing. So now I'd like to start a treatment for respiratory illness. My question is, can I do both of these treatments at the same time? I don't want to stop the Corid treatment if at all possible. And what is a good treatment for respiratory illness?