So I ended up getting Corid. I would have rather had the Sulmet, but $55 for pills that I would have no idea how to break down/dilute/give to chickens, I passed and went with the less invasive(and far less expensive!) Corid. Hoping it will work! Correct me if I'm wrong here, but yogurt, milk, etc. should be given AFTER not during treatment, right?? The sick chick seems to be trying to eat a little feed, but usually I can get her to eat some yogurt. Would yogurt make the Corid not work, or would Corid just kill the good bacteria in the yogurt?? I'm thinking if yogurt is the only thing she'll eat, at least she will be eating something! Thank you all so much for your expertise! It's so heartbreaking to see them sick!