So let me start with what I saw from your first post. "Canoeing" the large fan leaves curling up. HEAT, your room is overly warm is there any ventalation? Whats the average tempture when your lights are on? It looks to me like your cooking your plants and that why you lost so many leaves. The room should be 70-79 degres. Not 86, not 90, not 42. Your current porblem is more difficult to determine because I cant see the leaves very well in the pictures. Spider mites damage looks like white spray paint got on them, and if you pull a leaf then youll see small white egg sacks and small webs on the leaves. I cant tell from the pics. If its might go to the hydro store and buy three pyrithem foggers. sett off on in the room every other day when the lights are off. It's a food safe treatment. just dont use it 3-4 days before you harvest. although the 8 day cure it take to get the weed ready to smoke will give the smell and taste time ti comletely disapear.

Hope this helped. The more you grow the more problems you deal with.