a couple of my hens have developed black nostrils and are sneezing. I’m assuming it is mould due to dust or moisture. I’m renovating the coop and will definitely be taking this into consideration. In the meantime, how do I treat this? I have antibiotics from the vet that I got when my rooster got a respiratory infection and it worked great, wondering if it could help with this? I’ve seen a lot of articles diagnosing this issue but haven’t seen a single treatment option. Thanks!