Two weeks ago I bought 6 buff Orpington pullets from a local breeder. Several days ago I noticed one in a corner of the tractor standing with eyes closed and breathing through her mouth. I am new at this so didn't think much about it until tonight I noticed her eyes were very swollen. There was a second chick whose eyes were all gunked up and shut. I got warm water and wiped her eyes and she is able to open them although only partially. My other chick, however, had thick white pus that came out of her eyes with quite a bit more in the right eye than the left. She partially opened the left eye but not the right. I am sure it hurt as I wiped and even had to grab a corner of the white pus to pull it out. I put her in front of their water and dipped her beak into the water and she drank a pretty good bit but without seeing it. What do I do? I am heartsick. I read to out some apple cider vinegar in their water. I do have a sulfa antibiotic. Do I give them that? They are in an enclosed coop at night with ventilation and a heat lamp. Can anybody help?