Howdy Farmers,

This is my 1st grow. I'll be starting a diary on here shortly but wanted to get some input on this plant. I know how I caused this, just cant figure out how to fix it. So here we go....

Strain: Sweet Tooth/fem
Medium: Promix -- 2gal pots.
Nutes: H&G A&B soil
Lighting: 6tube T5 set-up on 18/6 -- Lights are about 3" above the canopy.
Soil PH is 7.2 this plant, 6.3-6.5 for the others.
Feeding at 5.6 and 750ppm
RH in the room stays 65-70
I have the room temp at 72
Soil temps are in the 72-75 range throughout the pots.

This gal is now 31 days from germination. She has 5 sisters who look good and whose pics I will have in the diary later today. She was transplanted into the 2gal from a solo cup at 2 weeks. 7 days ago I watered for runoff with this plant and she has been like this since. Growth is still keeping up with the others but leaves are curling severely and she is pointing at the lights like nothing I've seen. Her Ph is up and her medium has not dried at all in a week.
I found this one leaf in the lights this morning and the little burn you see below.

Thoughts and Ideas will be greatly appreciated.
Miggs