Could this be Leaf Septoria?

There are 4 plants in here; 2 white widow extreme and 2 Northern Berry. 3/4 are bangers but 1/4, a White Widow Extreme has these leaves. They arrived a couple weeks ago on the fan leaves below. I attributed it to potentially low nutrient solution before I transferred all the individual DWC's to the RDWC system.
But now they are back again in the newer growth and only on one plant.
Th anks

Calcium def.

Definitely calcium deficiency.



Calcium deficient leaves.
(Both pictures copy/pasted from Growweedeasy.com)

Great thanks! Well not great but easy fix. Fuck they consume a lot of calcium! I mean I add up and above GH 3 part but I guess not enough.

Bearijuana said:

Great thanks! Well not great but easy fix. Fuck they consume a lot of calcium! I mean I add up and above GH 3 part but I guess not enough.

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LED lights?

Yeah LED's really seem to make a plant consume more cal/mag.

Logan Burke said:

Yeah LED's really seem to make a plant consume more cal/mag.

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Well that would make sense. Between my cobs and RO water, I'm adding like 1.5x the recommended cal-mag at the peak of bloom. Anything less and they start purpling and showing deficiency symptoms.

Joint Monster said:

Well that would make sense. Between my cobs and RO water, I'm adding like 1.5x the recommended cal-mag at the peak of bloom. Anything less and they start purpling and showing deficiency symptoms.

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If only cal-mag didn't contain nitrogen... *sigh*

Logan Burke said:

If only cal-mag didn't contain nitrogen... *sigh*

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What Cal-Mag Are you using?

hotrodharley said:

LED lights?

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Yup. I use the GH Cal-Mag. It sure adds ppm to a solution!

I use GH CaliMagic, Joint Monster.