I have 8, 11 week old chicks, yesterday they was eating and drinking just fine. Today I’ve been out there a 100 times and 9 of them aren’t eating or drinking. They are all puffed out and standing with their eyes closed and head sunk, which is very unusual because when I go out there they usually run to me. While I was feeding this morning I noticed there was one small little poop that had blood in it. What do I need to do? Remove the ones that are seem to be okay? They are in the same coop with my older bird but my older ones can’t get to them. What needs to happen?