I bought 20 chicks from the farm store and got 25 from McMurray Hatchery. Day 1 was great... Day 2, all of the chicks from the hatchery were lethargic. I separated them immediately. Day 3 lost 5 chicks from hatchery, but the rest looked OK. Day 4, all good. Day 5, lost 7 hatchery chicks, and the others are lethargic again. Day 6, farm store chicks are now acting lethargic. Day 7, They are all dropping like flies and my heart is breaking. I am down to 20 live chicks, and a lot of them aren't doing well. In fact, one died while I typed this. Here's what I have done: -Probiotics/electrolytes in water -egg yolk in food -put regular water bowl in cage and nipple waterer -kept constant eye on poop... Nothing abnormal except for a few keep getting pasty butt. It's like they are fine... And as soon as they start showing signs of lethargy and stumbling around, they rapidly decline within a couple hours and die. Any ideas??