Jumpingspider said:

I've had this issue on my RS11 plants only. No issue with the MAC growing side by side. Starts with slight Lightening in between the veins that looks kinda like variegation, then eventually it gets to the speckled stage on the middle-age leaves, so it's gotta be a mobile nutrient that the plant isn't uptaking. The stems are pretty red/purple also, on everything, including the MAC which could be the LED lights? I do think the dark green also hints at too much N... I'm stumped.

Grow details:
Temp: 75-80f
Humidity: 54-61% RH

Medium : Coco

Water: Reverse Osmosis

Nutrients Per Gal :
5ml MSA
7.5ml Canna A/B
2ml calimagic
1g Epsom
10ml Cannazyme

Ph: 5.9

Light: luxx 645 at 40% power 3 feet above canopy
Fans are oscillating and not really blowing directly on them too much.

I am considering flushing with just RO and Calmag and then starting with a lower base nutrient, but i can't decide what to do here.

Any thoughts?

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GrimReffer said:

What kind of EC or ppm is your nutrients going in? Have you checked runoff at all? How often are you feeding? Maybe do a slurry test to see what coco ph is.

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Jumpingspider said:

going in:
Ec 1.4
Ppm 720

Runoff ppm : 1050
Ec 2.11
Ph 5.86

Haven't done a slurry test. I'll look into it

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Brettdawg said:

Lower your ec goin in . Ideally u dont want your run off ec being to much higher.

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Jumpingspider said:

I guess, but isn't it going to go up no matter what I do unless I give them a flush?

I'm about to flip to flower so I don't want to deprive them of anything right now either. How much lower should I go? Or should I do a flush with some ro and calmag then start feeding lower ec maybe?

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Jumpingspider said:

going in:
Ec 1.4
Ppm 720

Runoff ppm : 1050
Ec 2.11
Ph 5.86

Haven't done a slurry test. I'll look into it

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GrimReffer said:

You have salt buildup which is locking out certain nutrients. I would flush plants with a low EC nutrient solution like .5 EC until runoff is close to what your putting in. Then lower your base nutrient down some get closer to 1.0-1.2 EC going in. That cal mag your feeding has nitrogen in it so probably a bit high in N. What are your watering practices? Are you watering everyday or multiple times a day? Are you keeping the coco moist or letting dry out?

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GrimReffer said:

You have salt buildup which is locking out certain nutrients. I would flush plants with a low EC nutrient solution like .5 EC until runoff is close to what your putting in. Then lower your base nutrient down some get closer to 1.0-1.2 EC going in. That cal mag your feeding has nitrogen in it so probably a bit high in N. What are your watering practices? Are you watering everyday or multiple times a day? Are you keeping the coco moist or letting dry out?

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