Bagseed grown under 2 75w CFL's. Plants have been doing great for a first time experiment but one of the plants seems to be headed south. I've been using a 20-20-20 mixture once a week. i switched to plain water a week and a half ago and havent seen much improvement except in the very top of the plant. I switched to a 12/12 cycle about 3 days ago. Any suggestions? Should I flush the plant?