I just got done dealing with these vermin. I used avid and followed that up with
forbid 4f. Only use these in the veg stage, not in flower. I also have mightywash
for flowering. You can get avid and forbid 4f on ebay at an affordable price.
Right now I believe I'm mite free and everything looks healthy again and just
switch them to flower. Remove any damage leaves and watch your new growth,
broadmites love the new growth. Good Luck