Hi, I'm new to raising chickens. I've got about 20 adults that are all very healthy. As well, 15 adult guineas. I have about 15new chics and they are slowly all dying of the same thing.... their eyes swell shut, the birds become very lathargic, then die. Anyone have any idea what this could be? I've started putting a general antibiotic in their water(as of today). Any help would be appreciated.