In my flock of 9 6-8 (ish)month old pullets only two are laying. I've been being patient but Ive also been noticing feathers all over their coop which I kept thinking was molting but it's been going on a long time so I'm suspecting mites now. I don't see any mites on them but I still think it might be why they aren't laying. Is there something that is safe and effective I can use as a precautionary treatment? It seems like I read something about seven dust once but are there any natural yet effective remedies?