Light Burn or Heavy Feeder?

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I'm curious as to what you guys think this is. @CannaGranny you're probably dealing with something similar? One of my plants is displaying the below symptoms while the other 3 are very green and vigorous like the attached photo.

The plant in question is the most-directly underneath my Phlizon FD8000 running at about 550w. I just moved the light up a couple of inches but it was about 14" away from the tops.

Same strains, same feed amounts.

 

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It's nutrient burn.. lower your ppm alittle... also looks like early stage potassium issue.. possible lockout from Salt build up.. I would flush the medium and calibrate my ph meter before I water again...

if growing organicly.. i would be adding microbes and enzymes to the medium.. the microbes help the plants uptake food by creating enzymes that breakdown bone meal and makes it more available to the plant.. helping balance the medium over time...

Good luck sir..

It was early sign K deficiency, definitely not nutrient burn & these plants are given EWC quite regularly so they also didn't need a microbe boost but yes you are 100% right about them being necessary for nutrient availability! It was about 3.5~ weeks since their last top dress/amendment so nutrient burn was never even a question.

Here are some update pics/progress pics of the plant that was concerning me:



I slowly started to see some signs of the K def progression happening on the other 3 plants but they were caught in time.

Thanks for the input everyone