My Silver Phoenix Too is making a rattling noise & sounds like he's snoring. He has a little bit of dried up mucus in one nostril I tried to remove it but he wasn't liking it to well. He also has a hi pitched crow that isn't normal. I noticed this last night when I was locking the coop door. He's the only one in my flock of 4 doing this. Their coop is ventilated with no drafts. It is 4x8 with 3 brooder boxes. It has been cold about 6 nights here & they have had heat lamps when it dropped below freezing. I have Duramycin -10 tetracycline hydrochloride soluble powder & Aureomycin 4g medicated crumble Chloe tetracycline type c medicated feed. Would either of these work? If not what should I get?