I inherited two older chickens; I've had them for almost a month. I have a brand new hen house. They have been segregated in another part of the hen house from my 5 week old chicks. Just thinking about a little trial meeting between the two this weekend when I noticed that both chickens have raised scales on their legs. I believe I have mites. Clearly I will have to treat all my chickens and my house..but..what is the most effective thing I can do....I keep reading about Sevin dust...sounds a little posionous to me...I need effective treatment fast!Give me your best ideas for treatment..please!!