i have a ton of chicks. some in brooder boxes, some running loose in my shop, and some in a run. i have noticed that all of the chicks that i hatched myself, that are in the brooder boxes, all seem to be fine. however, i've got a bunch of chicks from tractor supply, and a bunch of other older ones in my run with them. now, alot of them are pooping blood. what do i do about it?? how do i make it stop?? are they all going to die?? i've already lost at least 3 of them. i'm putting vinegar in their water as of last night, cuz a farmer friend of mine told me that i needed to do that and that it's the same as putting antibiotics in their water. what else can i do? am i going to lose my whole flock. i moved some of them into the coop with my full grown chickens, and then noticed that a few of those ones were pooping blood too. are my full grown chickens going to get it now too?? i'm really worried now. not to mention i'm supposed to be getting 4 6wk old poults today. UGH!!! i cannot put them anywhere near the chickens. i don't even know if i want to bring them on the property. any and all advice would be greatly appreciated.