So earlier in may I bought 13 imported English orpingtons. I was really excited to breed and sell their chicks. So that afternoon I was looking at a thread for coop brooding. So I was brooding them in the coop they had a heat lamp and the whole 9 yards. That Morin two were dead. About 3 days later another died. Then another then another. I lost 7 in total. None had any symptoms except they just got tired slept slot and died but some didn't even have that. There was one that had a violent seizure and died but I don't know what could have caused that. So the person I got them from agreed to replace them. He replaced them with older birds. The ones I got originally were one week old. The new ones are 6 weeks old. So when I got home from getting them I put them in a coop, and all seemed fine. Then about an hour later I went out to check on them and one was dead in the corner. I am so upset that this keeps happenening. I am raising them no differently than the other hundreds of chicks I have raised. I have three different coops. One for Ameraucaunas, one for pullets, and one for the orpingtons, the orpingtons' coop is about twenty or so feet away from the ameraucanas. I don't know if I need to quarantine them farther apart or what. Usually the ameraucanas free range in a big run that encloses all three coops, but for about two weeks I wasn't going to open it for them so they can't got to the orpingtons. I have no idea what is causing this or how treat it. I have the chicks on medicated feed, and electrolytes and vitamins, and I put VetX in their water. Then one of the chicks now had wry neck so I'm giving her nutri-drench orally because I read that is supposed to help. It feels like all possible chicken problems are happening to me all at once. Anyway if you guys have any idea what is going on and how to treat it, any input would be greatly appreciated.