Mystery Spots

[Ziplock]

This is my first post; be considerate.
My 4th grow, still a lot to learn.
I am getting spots on a Hawaiian that looks like paint splotches. If it progresses like on her clone mother, new spots will appear on existing affected (mature) leaves and on additional leaves as grow progresses. I haven't connected this symptom with any defect in the product, but that doesn't mean there is none.
I cant identify it in the Disease ID photos. Anyone have experience with this?

Photo folllows:

420 Magazine

CONDITIONS
Hawaiian
Sativa dom.
6 plants in grow: 3 U2 Kush, 3 Hawaiian, only one Hawaiian affected
Veg stage, approx. 6 weeks
Indoor
Soil (ProMax)
3 gal fabric pot, repotted from 2 gal one week ago
one 600w HPS light on 18/6 cycle
Light is 18" from top of plants
Separate fans blow across tops of plants and tops of pots
78F Day/68F night
45% RH
7.2 pH (soil)
Recently treated for mites, no evidence of survivors after 1 week.
Plants are watered individually, using weight as guide. Avg. 1/2 gal per plant, every 5 days
Using tap water, 7.0 pH, containers left open overnight to allow dechlorination.
Fert once with Foxfarm Bloom, 3 weeks ago.
Room size: 4X8x7ft. White walls, exhaust fan, circulating fans

 

[BuddroGreen]

Can't find anything on ProMax soil, never heard of it.

If this is ProMix soilless medium, then you need to have your pH @ 6.3 - 6.8pH, those splotches look like pH issues.

 

[Bapple]

I think the mite treatment might be your culprit.....


If you have a look at my journal, those same type spots appeared on my AutoMazar after I sprayed with a slightly too strong essential oil solution.

They are not aesthetically pleasing but don't harm the plant and won't affect new growth if that's the problem......

Happy growing

 

[budstud]

Ph is too high, needs to come down. Nutrient uptake of Zn, Fe, and Mn are slipping. In regard to the spots, looks like ph fluctuation.