Yellowing leaves, please help

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1

I’ve got a few Northern Lights and a few California Dream going in separate areas. Same Coco Loco medium for all and same municipal water with 6.2 ph with no nutrients. Humidity is down to 60/65% and temps still in mid 80s day temp and mid 70s night temp.

Viparspectra V450 on the Northern Lights and up until last night was a Viparspectra V600 on the California Dream but now an HLG 300 V2 rspect on them. I put the V600 on the Northern Lights when I replaced it with the HLG fixture.

This Started on 2 out of 3 of the NL and is continuing on them, but the 3rd of them is still nice dark bluish green with no spotting or stippling. It all seems to be located primarily on the newest leaves.

The CD now is showing something similar as well but only on lower leaves and only on 1 of the 4.

Narrow leaves are NL and broader leaves are CD

Please help point me in the right direction.

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2

I raised the HLG fixture slightly higher than the Viparspectra unit was and have it on 75% intensity. I also slightly raised the V600 from where the V450 was. But this problem was there before the lighting swap.

3

Is it deficiency? Too much of something? Herpes?

I’m retesting soil ph and ppm when I get home and will post what I find.

But please help guide me in the right direction, this is a kind of important project I’ve got going.

4

Well I’m new to growing weed but grow many other plants for a living. First photo resembles a magnesium deficiency, the rest look like water got on the leaves and cooked.

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5

It doesn’t appear to be a lighting issue, and one thing I know, is the two plants are not expressing the same issue.
Coco loco. Is that medium all coco, or part? You can expect to see signs of Mg lockout when growing in coco, unless you are supplementing.
They look to be a decent size to consider starting a feeding regimen.

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6

Coco Loco is a Fox Farms potting medium. It’s got all sorts of additional stuff in it like bat guano and earthworm castings.

I’ve got some calimag that I can add. 1/4 strength or more?

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7

May have nailed down what I thought were your water spots. Boron deficiency which will also affect Mg uptake. how-to-fix-boron-deficiency-marijuana boric acid is the fix. Like to someone else chime in on this though. 2 different plants right?

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8

Yes, two different plants

9

Yeah, that would be fine. You can always add more if they respond well.

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10

I’ll cross my fingers and wait now. General Hydroponics Flora series and CaliMagic added tonight at half strength. I’ll wait and see if it gets better or worse and post it up here

11

I’d start with a Cal/Mag supplement. It’s a very common deficiency that can affect blotches in leaves. Many indoor/starting potting mixes have little or no Cal/Mag added to them. Would also recommend an iron supplement such as spray n grow. I feed direct to the soil every other watering outside of fertilizer schedule.

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