Our flock of about 30 has been sneezing and has runny noses. We've used the general antibiotic, tetracycline, but it doesn't seem to help. Any suggestions? A farmer that we buy our chickens from said that when his flock was sneezing, it was because of elongated mites or something like that, that get into the birds' sinuses. I haven't asked him what it was yet, but does anyone know? I'm trying to do some research, but I thought this would be a good place to ask. Thanks!