plant prob with pics

hey guys a buddy gave me a clone it is healthy looking but the leaves have produced littlewhite specs i had mites but thought i had gotten rid them. Any suggestions also, when i water should i use food every time?. I know to leech them and such just a neewbie...

looks like heat stress. You need to get those temps down and possibly raise the light. If this does not fix your problem, i'd say look into over watering or possibly even nutrient burn. If it were me, I'd flush the plant, re-fert, and get those temps under control pronto.