What you need to do is pick you up 4 things...
-Can of Pyrethrum Fogger
-Bottle of SM-90
-Bottle of Einstien Oil
-Spray Bottle
First you use half the can and fog your grow area for a few hours and that'll kill the adults... but not the eggs... so about 4 days later hit'em again same as the first time and should kill the hatchings... NOW... rinse your fan leaves good to remove the casualties...
about five days later... hit the TOP and BOTTOMs of you fan leaves and it won't hurt if you spray this in the flowers too...
Mix warm... almost hot... water... I usually do 1 quart of warm water... mix the SM-90 with a 5:1 water to SM ratio... and a teaspoon of the oil... shake well and DOUCE the bitches in it... it will act as a wetting agent and the oil is not a favorite of the mites... continue to do this to all your plants weekly to prevent them again... then when your harvested... use a 10% bleach solution and clean EVERYTHING!! Your lights, walls, floors, fans, everything... also wouldn't hurt to get an idustrial bomb and clear it out before you go again! Otherwise they will be back! They are the devils! I've just gone through battle with the lil' bastards!!!
Good Luck!