I noticed one of my hens is have wet sounding breathing, I thought it was due to the heat. Now my rooster is doing the same thing, they both sound like they have a cold, with a little sneezing but no discharge and they are not gasping for air. So if it is a respiratory issues that is spreading, should I use an Antibacterial (have Sulmet) or should I use an Antibiotic? If antibiotic what type? Thanks for any help you can offer.