Its a 3 part question
1 how did they get in , using a intake filter and exust duct system that has a flap to close the exust after venting
2 Now comes the fun killing the breading mites
a. use raid every 5 or 6 days till the bug, egg , larva are all killed
3 Make sure your clean when you go in to the room. Any one of your friends can bring them in to you home. BUT you of course know no one knows you grow. Always clean anything going in to the grow space, no exceptions.
NOTE raid is photo sensitive so the light will help it disapate.
I only will go into the kill sequence 3-4 weeks before harvest MAX.
DO NOT LET BUGS BUG YOU , KILL THEM.