Hello All....I grow White Russian taking clones from a mother plant, plant is from non fem seeds. For now I have a small mega garden/ flood and drain hydro system/ 15 plants in hydroton clay pellets or balls. 600 watt light with inline fan and enclosed hood/ room temp is 73 degrees/ humidity is 40 percent. I use a six part mixture of general hydroponics nutes/ 600-700 ppm in veg/ 800-900 ppm in bloom, anything higher in ppm seem to burn the plant, even at these levels I have what I believe to be tip burn, but don't know for sure. In veg state the plants thrive!!!! in flowering stage, around the 3rd or 4th week ( I'm starting 4th week today) the leaves begin to get tiny yellow spots on the lower leaves and work upward as flowering progresses. The leaves eventually turn yellow and look like they are dried out or deficient, I don't know....hopefully you do.....thanks all 
