Trying to be positive of deficiencies not completely possitive.

Thinking it's a Mg just wanted to be positive going into mid flower. Alien vs triangle strain running advanced nutrients in coco with cal mag and try to keep pH between 5.5 and 6.5. started towards bottom small and large fan leaves. Just got led so wasnt sure about light burn or not and not many great pics out there. Thanks for help.

Pic of plant ...

Post later. No more leaves affected tho except for a couple tiny leaves at bottom. Every stem is red tho and even most of middle vein in leaves are red