On plant only deficiency....?!

One plant out of my 7 is showing some sort of deficiency. Here are the details:

Medium: Fox Farm OF
5 gal fabric pot
Spider Farm 4000 led on 70% 18” above canopy
Feeding once weekly ph 6.5-6.8 FF Trio plus calmag/ PPM per feed is 1600 or so.
Soil runoff Ph stable at 6.75
Watering once (besides feed) a week when top 1” soil is dry (ph 6.7 water)
Week 5 of Veg
Temp 75 Rh 68%
Strain: unknown (hybrid)
Full AC infinity in line fan, two small circulating fans.

Top and bottom growth looks ok- it’s a few leaves in the middle. Plants did have a MAG deficiency but corrected and healthy since. These leaves have changed slightly since then. There is only about 4/5 leaves showing this and the photo attached is the worst one. No other plants show any similar signs (5 of my other plants are in organic dirt- this is one of the two in the FFOF, the other FFOF plants is much better- maybe a tiny bit of the same problem but not like this one).

Will upload more images if needed just didn’t want to not be able to blow this one up so you can see close up.


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As far as I can tell its still mag deficiency but I was told it takes about 2 weeks for your plant to reflect the fixes to the soil

Ok. That’s kinda what I was thinking, I don’t see it in any other growth so I thought I may have fixed it. I know these few leaves will never recover- so I’ll just keep an eye on other healthy leaves. Crazy how much mag they are demanding. I just transitioned from an outdoor grow in garden boxes 5 feet tall and they didn’t demand anywhere near as much mag as these 1.5 foot plants!


Is your fixture turned up too much?

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You might want to consider adding a Tsp of epsom salt to each gallon when watering moving forward. Maybe the first time using 1/2 to 1 TBSP per gallon when watering.
May also be a calcium issue showing with the brown spots. Got any gypsum or oyster powder?
Hard to tell from just one leaf

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Give them a foliar feed of 1 tablespoon Epsom salt to 1 gallon water at lights out . It’s A Quicker way For your plant to uptake the Mag.

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