3 days ago I received my first chicks! Have adult chickens for awhile now, but this is my first time with chicks. Everyone has seemed in perfect health since I got them. All are eating, drinking and are very active. However, some have one eye closed and one had both eyes closed for about a day. This seems to come and go, as it's different chicks, and different eyes every time I check. Could this be from them pecking at one another? Should I be concerned they may be sick, even tho they otherwise appear healthy? Any info or tips is greatly appreciated!!!