Okay, we have some 6 week old chicks I started transitioning from brooder to the main coop with the laying hens about a week ago. I put out some of the bigger (and slightly older) girls, and brought them in at night. I thought because I was doing this gradually and had been giving medicated feed I could avoid a coccidiosis crisis, which is what I suspect I have on my hands. (Please tell me if you think it is something else.) A few days ago, two of the chicks began fluffing their feathers and acting listless, huddling. I noticed bloody poop. I put the 8 others outside for good because the brooder no longer seemed very healthy and they were ready anyway. I continued with the medicated feed, began putting cider vinegar in their water (per instructions I read here), and yesterday acquired some Corid which I diluted in the water of the sick chicks still in the brooder. Sadly, I think they're goners; they are so frail and sad. Now I am worried about the other chicks; every time I look at them I think I see ruffled feathers and huddling, and then a minute later they seem okay. I decided to give them a round of Corid 9.6% -- 2 TBS per gallon based on the numbers I've seen on this site. But I don't want to poison them! And they will be sharing this water with the big birds. Is this the right amount for chicks? Is this okay for big birds? Should I be doing this? Is this even coccidiosis, given that I've been using medicated feed? What else can I do? I could use help! Thanks so much.