IM griowng in fox farms ocean soil and using there nutrient line.everything was cool threw veg but once i changed the light to 12/12 my bottom leaves started yellowing and some green ones have spots my day temps are 78.5 and night is 69/71.0 after feeding and or watering the run off water ph is 6.0 can someone please help. also these pics are after i flushed the plants are in2nd week flower and there master kush from nirvana.400mhveg 400hpsflower