Looks like necrosis from nute lock out. And probably overwatering.
No nutes for 2 weeks. Flush with water once a week.
After 2 weeks try 1 teaspoon of Miracid per gallon of water once a week. It'll take about 2 weeks with the miracid and they should perk right up. If you use cfl's you have to back way off of nutes.
killerweed420 Reviewed by killerweed420 on . Don't know where I'm going wrong - HIGH RES PICS! DOUBLE CLICK THE PHOTOS FOR SUPER HIGH RES!!! All photos were taken at the same time.. some just look different cause of Photoshop/lighting. First time grow. I have 4 lamps. 2 overhead, and 1 on each side of the plant. These are kept on 24/7. Two overhead lamps are 1 6500k Daylight CFL each. Two side lamps are 1 6500K Daylight CFL AND 1 2700K Soft White each (y-splitter). I'm using Miracle Grow Liquid All Purpose Plant Food at 1/4 strength. I water when the top soil is dry or just Rating: 5