theres a type of oil u can coat leaves with in any stage of growth that wil cause those little fuckers to suffocate. Not sure what the name is but google "oil" + "spider mites". Your plants look immature and like they need a nice dose of nutes too. I would recommend running distillled water ph adjusted to 6.5 with about 2 tsp/gall bloom ferts with a microbial enhancement like Big bloom from fox farm or any other soil based bloom nutes. After a week or two raise the light intensity because ur running outta time! Good luck man don't give up. I destroyed over 6 crops before I had even a decent yield. Failure is part of the learning process (as you well know by now lol). Keep it up man persistence is key.