We just brought home two 3-wk-old silkie chicks from a backyard breeder on Friday. One walks around shaking its head and opening its moiuth a lot. Now I noticed blood on the shavings and observed it passing a bloody dropping. So, if I need to treat it, I know I will have to treat the other chick, but what about my other 16 chicks (12 weeks old) that I have in a different brooder? They are awaiting the finishing of their coop and are in a large box in the same garage where I am keeping the new little ones. Do I also have to treat them? It is it imperative that I begin treatment immediately, or can I buy medicine tomorrow and start then? THANK YOU!