Could this be your problem right here? Maybe feed it more overall by switching to a heavier feeding schedule/chart?
Just my 2 cents.
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I’ve used the full GH line up for over a decade. Diamond nectar and floralicious are the only 2 I still use regularly. Definitely worth getting
Which one are you using now ? GH products is pretty expensive in Brazil… I’m considering change the line for another one which I can run in hidro but its be more acessible.
I will try it and add plus 1/5 of the portion what I added…
My ppm is around 659… is pretty low, I recognize… I will put it on 900 and see how it will develop. The true is I saving some nutes to the next cycle… I had a lot of troubles in this cycle and the care was downgrading and it is my first complete growing cycle… so I put in my mind which the knowledge is the most valuable thing what I will get from this cycle, so I’ve tryied everything… scrog, aero, dwc, coco, clonning, overferting…
Thats it… thanks for the 2 cents… I will transform it in 2 hundreds 
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@LionsNaughtyBeans
Have you checked growgreenmich.com
They have all the gh for about 50% off
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Its doesnt open for me…maybe because the region. I can try with a VPS but I guess they doesnt send to Brazil and many times its be taxed, plus the shipping costs makes it inviable. But thanks for the effort 
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Oh
Brazil i didn’t not realize
I did put the PPM at 820 and the PH in 5.95.
Let’s see how they will respond…
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Hey there, try the pH closer to 6.2 with your current formula, that should do the trick. Check out some of my journals on here, I use the GH series and a couple of core supplements…don’t have everything figured out, but one thing I’ve seen is that even in coco (hydro) in flower the plants want a higher pH than is typically advertised.
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I did noticed this too!
When they entered in flower, with PH on 5.6 they begins looks with deficiences, and reading about it I did take the conclusion the PH was too low.
One strange thing is, the PPM is getting higher and PH too, but the water is falling… I was following the chart bellow was one of the reasons what I let the ppm lower in range of 600 ~ 750.
I will check the ppm and ph soon and update here… I guess it will rise slowly… until the end of day will be on ± 6.1.
I need change de res water… just waiting some rain while I dont made my OR filter.
Check out some of my journals on here,
I will do this!
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Editing, now I remember… @George helped me that time and told me about the PH… so he is my savior… again.
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Looks like you have other problems than K deficiency to me. Bugs or fungus maybe would be my first suspicion.
How did you reach this ?
If is the points on the leafs… Its dust… I have been working on the lumber structure opening an air entrance for the grow room and cant put the plants outside to wash them… so, I cleaned better as I can.
Don’t see typical K deficiency signs for one. And it looks more like critters or fungus to me. I’m talking about the zoomed in pics especially.
@low_and_slow, today I’ve checked and the ppm is rising, water level is falling and ph is static… It makes me think the plant is drinking more than eating, and following the spreedsheet above, I would should add water to makes EC lower…
What u guys think ?
The ppm is on 928 (820 in last check ) and PH 5.95 ( maybe put a bit of PH UP to aproximatte it of the 6.2 ?)
I’m not an expert in recirculating systems, but generally my guess would be to add water to the desired level, check PPM, then calculate how much nutrient or pH adjustment to add to get to your desired EC/pH.
Can you post some close-up pictures in direct lighting of the ‘dusty’ leaves? I’d like to also follow up on what @PadawanWarrior is calling out here before we rule out a pathogen.
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Yes, sure! I will take some pics later… including with the microscope.
Hmm, that does sort of look just like dust or particulate… 
