New growth turning black

New growth tips turning black,lower leaves turning yellow and dropping.ph looks good,maybe nutes too low.i used a tester and it seemed really low.im using soiless potting mix and nature care organic.

Never seen this. I’m set to watch just to get an idea. First it looked like coco coir and then I zoom in and eww.

Also don’t know but watching to find out and learn

Fill this out post a picture of the complete plant could just be geneticsCOPY/PASTE the below list into your forum post.

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-What strain, Seed bank, or bag seed (photo or auto)
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-Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
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-PH and TDS of Water, Solution, runoff (if Applicable)
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-DWC? RDWC? Autopots? Ebb and Flow? Other?
-Distance of liquid below net pot (DWC)
-Temperature of reservoir
-TDS of nutrient solution
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I had some of that last year. Few weird looking leaves but it eventually grew out of it. Was never able to get it figured out. I am definitely not an expert so if someone knows what this is, I would love to know also.