I have six 9-day old Chicks. Since the first day one of the chicks has been sneezing a bit. Now there are 2 that sound like they have some kind of respiratory issue. When they breath it sounds like their nostrils are full of mucous of some sort. They are otherwise heathy in appearance. No nasal discharge, no discharge in the eyes. No bad smell. They are eating and drinking and just as lively as the other chicks. I am a first time Chicken mama and I am awfully concerned about this. Is it possible it is just a 'cold' that will pass? Or is it more likely this Coryza I have read about? I asked at the store where I bought them and he showed no concern at all, told me to give them sugar water. Is there any point in separating them from the others at this point or is it too late since they have been together for this long? Any advice appreciated thank you!