Could this be Leaf Septoria?

[Bearijuana]

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

 

[Budzbuddha]

Calcium def.

 

[Logan Burke]

Definitely calcium deficiency.

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

 

[Bearijuana]

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.

 

[hotrodharley]

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.

LED lights?

 

[Logan Burke]

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

 

[Joint Monster]

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

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.

 

[Logan Burke]

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.

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

 

[Joint Monster]

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

What Cal-Mag Are you using?

 

[Bearijuana]

LED lights?

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

 

[Logan Burke]

I use GH CaliMagic, Joint Monster.