Ive went from Seedling, took a week to germinate, placed into Rockwool cubes then into aeroponic 45G chamber, They have been in aero tub for 4th week as of yesterday, they are about 4-5 inch tall, They seem to be stuck at that height. I started at 390 PPM at 5.8-6.0 PH, 3rd to 4th week bumped...