@Papaye
THIS says it all. No more explaining yourself.
Here's a link for you to help you ID lice and mites, pics included:
Kill them with Permethrin dust or liquid concentrate, do the coops as well. You want to go natural? Bathe them in a sink containing a dish washing liquid, then rinse...
When I first started out raising chickens, I used DE as well. Then when I saw worms in feces and gave my birds more DE, it did nothing but empty my wallet. ACV is good for certain things, but again, it will not treat nor get rid of worms.
That's when I started using real wormers and I havnt...
@Papeya I'd bet if you had a belly full of worms you'd go running to the nearest hospital Emergency Room. Or would you gorge down DE and rinse with ACV?