I need to treat my flock for I suspect they have something going on (mites/lice). I am going to thoroughly examine this evening to make sure. I am getting information overload just from browsing the site. So my questions are...Is Ivermectin a good, fast resulting choice and What is the dosage used per bird? What about powdered Seven, GardStar's Garden & Poultry Dust....I have all on hand and just want the easiest and most effective. I have thoroughly cleaned and sanitized & dusted their coop this morning....top & bottom and every corner & crack. Advice from someone more experienced than myself would be appreciated.