What do you think is the problem and how to fix it? They are under CFLs (18/6) using Miracle gro (12-4-8 ) all purpose wit RO water (zero water filter) PH is about 6 plants are about month and ½ going on 2 the ppm is like at 1-200.. Did have the ppm up to 400 like a few weeks ago but dropped it back to 1-200… I want to put them on 12/12 to sex them. But want to figure this problem out 1st. Want to keep one as a mom and then move to bubbles... Oh, the plants are LST and how much under growth is ther suppose to be (pic 2) cause the tops are pretty full.