its the third week for my white widow need help please!!!! plant short and sick

Temps are at around 70 to 80,humidity at about 30%, Using two 105 watt multi spectrum cfl lights that are about 1 foot away from the plant And giving it stealth hydros micro and grow nutes that are pre packed for a 6 gallon resivor wich I am filling with tap water, ph levels around 6.0 ,6.2 can't figure it out bro
 
i agree looks like a nut burn, i have a sick white widow thats in flowering and 15 more tthat are about to go 12/12 becare with the white strains they are nitrogen sensitive, trust me
 
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