Nitrogen or Potassium Deficiency???

Hello friends it's been a while. I'm coming to you with a question about some yellow coloring on some low fan leave and some wilting I can't put my hands on,

Some Background:
G13 labs Auto Blueberry
6-7 weeks old
20 inches
Grown in flower pot and transferred to paint can (not sure if it's 3 or 5 gallon) at 2weeks
Cfl grow, Mostly mixed spectrum,all 27k once full flowers started. Currently using 5, intend to add more
In a tent it's whole life
Fox Farm Ocean Forest
No other nutrients
I don't measure ph ( not for lack of knowledge for lack of funds and supply)

Let me know if I left something out.

There some odd downward wilting as you can see. I doubt it's over watering because I tried starving then feeding and no change.
She's flowering nicely and seems to grow about an inch a day.
Just noticed some yellowing the lower fan leaves and I'm not sure if it's a nitrogen or potassium problem
Something else?

Any suggestions?

Looks like molybdenum deficiency and heat stress bro take some time on fixin those but looking great so far!

The dark green leaves clawing down could be N toxicity, which will lead to yellowing on the lower fan leaves. Wilting is also a sign of N toxicity.