This is my 1st grow. On day 35. Plant is only about 8

" 18-6 Light cycle. Growing in a 3 foot by 4 foot grow tent. 900 watt Philzon Veg/Bloom light. Hangs at 36" from canopy. Temps are 82 F. Humid stays around 45-50%. PH: 6.8 with run off at 6.3. Fox Farm Soil - FF Nutes.

Using any Cal Mag ?
Yes, but maybe not enough... I should only feed it 5mL per week correct? i have probably only been using 2-3 mL
Do you have the Mr Grow It book ? Great pics of issues to compare with, along with why and how to fix it.
Yes i do have the book, its what i have been going by, of course with some mistakes along the way. But i cant seem to decipher what is actually wrong.
Whats the ppm of your run off?