Leaf Diagnosis

[Imaskypilot]

I’m running 2 KO Crop autos in DWC. For the past two weeks, I’ve been getting these spots on KO#1, but NOT on KO#2, they both get the same nutes every Sunday on res change.
They are at day 74 from seed pop and this one is at day 28 of flower.

I keep the tent at 72-78°F, 50-60% humidity, 20/4 on the lights.

Today’s stats:
Water Temp PPM PH
1 - 66.4 950 6.0

Fresh nutes on res change yesterday:

I use 5 gallon buckets, but the useable space (below the net pots) is a little over 3 gallons, so I mix my nutes for the amount of water in the buckets.

CaliMagic - 3 tsp each bucket
Micro - 15 ml each bucket
Bloom - 40 ml
Liquid KoolBloom - 15 ml each bucket
Floralicious - 1 ml each bucket
Super Thrive - 5 drops each
Great White Myco - sprinkle each

Any of you good folks have an educated guess what is causing this?
Many Thanx!

 

[The Celt]

Best guess, once the picture loaded, it’s likely that she is more sensitive than her sister, different pheno maybe. Try cutting the nutes back a bit and see if she responds favourably without her sister complaining.