I have a barred rock rooster that I believe is sick. He sounds like he's sneezing. I don't see any discharge from his nose or anything, but he is making this sound that I am assuming is a sneeze. Can anyone recommend an antibiotic that I can use? I figure I will just put it the water for all of them just to be safe. I work at a farm store and one of the antibiotics we have says NOT to use on layers. None of my chickens are old enough to lay yet but I want to make sure I can give them something and it wont hurt the eggs when they do start laying.