Yes it does sound like spider mites, This is what I do I follow directions on a Bottle of neem oil, and also a organic bottle of bug killer that has Clove, Garlic, cotton oil I think and some other stuff, I mix it all in a gallon sprayer, I spray under all leaves every every 3-4 days for 2 weeks then once a week until plant is 3 weeks away from harvest. Make sure your lights are on the off side or they can burn!