Yellowing upper leaves with dark spots.

[Arsonist1]

Blueberry auto on week 7/8, in 5g with fox farms. Light tsw2000 on max 18/6. Temps 77 with lights 70 off. Rh 50 with lights, 60 off. Only fed it small doses of Mega crop. Using tap water that's been pH to 6.5.

This started 5 days ago and is just getting worse. I have flushed it and seeing no improvements. When I did flush I noticed the pH was low on run off. I seem to of fixed that now. It's mainly the upper leaves. Any help appreciated. Think it's got a few weeks left. Unsure if I should just chop it. Kinda bummed but my first go at this.

 

[smokedareefer]

Sulfur ?

 

[FFM]

Hi Arsonist1,

i wouldn`t chop it. You have only few weeks to go.
The leaves won`t repair anymore, also if you have fixed the problem.
It looks like a lockout, you have nutrien burn and deficiancy.
Just fix the PH.
Currently no nutrients , the whole plant looks green down under the yellow leaves.
All the best.