Well I wouldnt kill any plant, just water the soil thoroughly. I never grew with any florescense lights except for plants introduction into this world. Then I transplant and give them 400w hps. Good luck and you have to have the soil dialed in between 5.5-7.0 pH (potential Hydrogen) level. Just give them water that has been pH tested to be around the 7.0 range and give the root hormone like you have been. I never fed my plants anything during Veg. except SuperThrive and after 32 days I switched to flowering and I am following B.C. Hydroponics directions and my females are about 2ft tall already and I am only on flower day 6 and my plants are healthy and green. No nute burn. Oh, by the way, this is my second grow and this place taught me everything I needed to learn by trial and error and learn from it for the next grow. Check out my journal.