Hi everyone! I am a new small backyard chicken owner. I currently have 6 chickens, ranging from 8 months to 12 months. 1-Buff Orpington, 1-Delaware, 2 black-sexed link and 2 red sexed-link. I saw one of my reds with a fluid eye bubble, very little mucus, and I cleaned her up. But I do hear several others sneezing, congestion that rattles. I want just treat all of them at the same time. I don't think I can inject them so what other options do I have. Oh, they are all eating, walking and drinking very good that I can see. Only 2 have started laying eggs. So will there be any egg withdraws with the medication you recommend? Thank you in advance.