Im a first time grower, growing indoors my plant is about 8 feet tall and i have 2 others also, I switched them to 12/12 about 20 days ago. I have 2 pole lamps with 5 bulbs each 60W natural light bulbs. My big plant is shriveling all the old main leaves are dying and drying up. WHY????? PLease help is it to hot to much light too much water can someone please help me Ive been growing this thing for 6 months and dont want it to be for not!!!