Hi all! We adopted several older hens (3-6 years) a few months ago. We quarantined them for a week before mixing them in with our others and had no problems. Everybody looks and acts perfectly healthy. But... about two days ago, I discovered that I could hear one hen breathing. It doesn't seem labored, but does sound a bit congested, fluid-y. Her eyes are bright, appetite and energy good. No mucus, nothing swollen, no other symptoms. Should I just wait and see? Bring her inside and treat her with antibiotics? I have Naxcel and Penicillin from a lamb I just rescued (he survived!). Can I/should I give her either of those? And if so, what's the dosage? Thank you so much for your help!