If it is mites...the best that i can suggest, from experience, that HAS worked the best..(keep in mind,that they are very hard to eradicate completely)..is to use "Organocide" from home depot or lowes alomg with lady bugs.Now listen, everyone is gonna have a suggestion or an opinion, which IS cool, but this worked for ME.I introduce ladybugs to EVERY indoor grow.You just cant go wrong.You can order onlin, like 500 for $6.00.
Another little bastard of a problem are fungus gnats.These lil' SOB's will wipe a garden out!!!!!Neem works for these at least slows down the adults and their newly laid eggs and larvae.Ive done everything from Neem treatments,emergency repotting, yellow sticky cards, Sand on top of the soil,(which they have a hard time penetrating), all sorts of dumb shit that just breaks one's heart.
Hopefully, with those problems in mind, if it has to be something,you best hope for just nute burn.Have you been over feeding?High nutes with every watering? lemme know where your @, and I can hopefully offer some other qualified opinions, along with many other accomplished growers.....keep ya head up,compared to the problems in this world this is just small shit.