I recently bought 4 chicks that are 6 weeks old. The person I bought them from said they were being fed with chick crumb with acs. My other chicks are being fed this so when I got the new chicks I just filled their feeder with it. The have started all looking lethargic with closed eyes. They are eating and drinking, but I had to cull one ad it collapsed and started pooing alot of blood. I separated it and it deteriorated. These chicks are separate from my others. If they weren't being fed chick crumb with acs and I started feeding them it could it make them sick?