I dont know what to do. I have never had a sick chick or bird yet. I have a 2mo old black cochin in the brooder with 3 other birds we got a few weeks ago. She seems completely fine until you put her up to your ear. She sounds crackly when she breathes. I dont know what to do. All I have is Sulmet and I cant afford anything else since I am now a single parent of 4 on a very fixed income. Please help. I am very worried for this little gal, her 3 brooder mates and now for the 17 other girls I have in the coop outside. They are in my garage in a giant well ventilated topless dog crate. It has pine shavings, they are on medicated crumble, they have a heat light, and all seem happy, healthy, and very active. What else can I do for her. All of them I am sure have been exposed so I plan on having to treat the other 3 in the brooder too.