I am new to raising chickens and have a flock of 9. 2 laying hens and 7 pullets (2 olive eggers and 5 barnevelders) the pullets came from the same local farm. Within the last week or so one by one my barnevelder's have been getting runny noses, but only them. Only 2 are sneezing and other then the clear runny nose and sneezing they are acting fine. No raspy breathing no strange poop or fowl smell. I started the whole flock on an antibiotic in their water just to be safe. I'm stumped on what it is they have and why just my Barnies. Can anyone help me?