I have a 10 week old Buff Orpington cockerel who has a whistling nasal passage when exhaling. He crows fine, is eating, drinking, and acts perfectly fine. He just has this closed mouth wheezing. I put a little VetRx on the bottom of his comb this morning right near his nasal passages. Is there something else I should do or watch for? His eyes are clear, and his poop is normal, no other symptoms at all.