Well there's litterally hundreds or thousands of types of mites, only a few that are common and will harm your plants. I noticed a few spots on the lower leaves of my plants and underneath the leaves that had em were the mites. They spread super quick if not taken care of, and I've heard ladybugs will eat them and also that they wouldn't so I don't know cuz I've never tried em. All I know for sure is the permethrin/pyrethrin/Ivermectin stuff works wonders, I've used it for years on my reptile collection(snake mites). And yes, alway quarantine new arrivals of anything whether it's clones or animals or whatever because anything can carry pests that will wreak havoc on stuff you have.
Miticide - Wikipedia, the free encyclopedia