had them once from bringing an outdoor plant inside. let me tell you they are a bitch. im lucky my infestation was not bad and i was able to get rid of them. if its bad enough, like all over the place, your probably better off just destroying/sterilizing everything and starting over. the way i got rid of them was i cut off the worst infested part of my plants and threw it out. it was during veg but still cost me some yield. i got some insecticide spray from walmart schultz brand. i got 2 different types, one the active ingredient was pyrathrins(never use around cats or fish), and the other was neem oil. you can buy both chemicals in bulk and mix your own spray for much cheaper though. if mixing your own be careful with neem oil. too much can burn your plat's leaves. i kept using both sprays. especially under the leaves. you need to soak the entire plant. i mean drench the shit out of it. bring it in the bath tub and do it everyday. eventually my mites died off. pyrethrins kills, neem oil fucks with hormones and will greatly slow reproduction. the thing is its hard to kill all the eggs. you spray often so when the eggs hatch you kill the larva. even when drenching the entire plant, its hard to be sure if you missed or if some, somehow survived.
now you need to be sure of future prevention. never take in anything from outdoors unless you thoroughly inspect it. same goes with plants from other people. so many indoor growers think they know how to grow good dope. well sadly, most i seen suck at it. dont trust anyone elses plants unless they have proven to you they know what they are doing and your sure their plants are pest free. lot of people dont take these precautions and get fucked or just dont care and grow some ugly homegrown dope. and sadly a lot of smokers dont care cause they just care about getting high, not getting high off premium dope. GL!