So I got 13 Cornish cross' and they're a week old today. And I've already lost 3! I need help cus I'd really like not to lose anymore. I know they're a hard breed to keep all alive but any help would be greatly appreciated. They're on 20% chick starter and I've added a special vitamin additive meant for meat chicks. They're in a wooden box I made in the garage and the current temp is 90-95. The get fresh food & water daily and fresh bedding twice a week. They only really eat and sleep I've noticed. Many of them will fall asleep with heads resting on the feeder. No signs of pasty but or bloody stool. Poop has been light brownish red and runny but not always. Many are formed. The first died at 3 days old, second 5 days, and final one today at 7 days.