I have a few of my chicks that are sneezing. They have been sneezing for a week or so but everything else seems fine. No runny or goopy eyes or nostrils and their chicken poop is all normal. All their vents are normal as well. I have all my chickens together in their coop/run for the winter and have no way of separating out the sneezing ones. it doesnt seem to be spreading. It's just a few of my white chicks. Is there something I can feed or put in their water that would be safe for all my chickens?