A little leaf discoloration GG#4

Back to soil, got this Gorilla Glue #4 clone from a buddy, threw her in a 4 gallon pot and she has been vegging.for 27 days. I cut 9 clones from her 11 days ago. She is in Fox farms Happy Frog. I have been watering using the General hydroponics Flora Nova expert drain to waste formula with an addition of some Cal-Mag. Was going 100%, just fed 3 days ago and starting to see a little discoloration in some leaves. Want to stop it before it begins. pH is usually right at 6.3.

Diagnosis and solution would be greatly appreciated. Thank you.

That is my grow closet with just the mother GG4 and a small 5g DWC GDP.

Here's a couple updated pictures. I did a plain water pHd flush and then pHd the water run off. It was a runoff of 6.4.. still not sure what this is affecting my GG#4. I'm only watering like once a week as well.

You keep showing the same leaves and they seem to be in all the same area, No?

I don't see anything in new growth, nor does it look to be spreading, is it?

Here's what a dialed in organic real deal GG4 looks like days before harvest