1. My 6 beautiful 3-day old silkies are scratching their necks, scratching under their wings with their beaks, and twitching their heads while sleeping. I can't see anything, but could they have mites? They're in the house, not around other chickens. Is it safe to use a little Permethrin in the bottom of their brooder when I change their bedding? Or could it something else? 2. Also they like to eat the tiny little bits of shavings...will it hurt them? I've looked all over for help and would appreciate any advice. Thanks.