Clawing and yellowing leaves with brown spots on them

[Proph]

Exactly. I was puzzled about the clawing leaves being yellow instead of dark green.
I will check the pH soon. I have a soil probe and also have a proper pH meter.

Edit: The pH is 7.
Don't know if this is good or bad for a pre-flowering plant.

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That's a soil ph meter and those will almost always read 7 no matter what you stick them in. You need a ph meter for liquids, so you can check the ph of the run off. You also need a ppm/ec meter to check the ppms of the run off. Adding more nutrients of any kind to this mix of already included nutrients could easily make the issue worse. Checking the ppms will tell you if you need to flush the ppms of the medium down to a normal range for autos (500-700 ppms max).

 

[Kush]

Hmmmm for soil you want to keep it between 6 & 6.5 but coco a little lower then that, definitely could be your issue but I’m no expert. I’m not sure how those soil probs perform, I’d check some runoff with a ph pen and adjust accordingly if the runoff is 7 ph the water going in at 6. Great looking plant! You will get it figured out.

Sorry, I spoke too soon.
The pH is not 7 now. The probe slowly dropped the reading from pH 7 down to pH 6 - 6.2