What’s Going On With This Plant?

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Dirtbag

Dirtbag

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I also think its potassium related. Looks like a combo of potassium and Iron def. Could be caused by an overconcentration of calcium from overfeeding. Could also just be light stress from your light being too close.

I would raise the light to 18", flush out the soil with water until ppm is below 1ec, then recharge with a balanced nutrient at about 1.2ec.

Also, I hate to say this but since you're using promix... Check for root aphids.
When you see issues on a couple plants but not others, often there is a soil born pest to blame.
 
Dan789

Dan789

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Was going to mention bugs also as a potential, first check is the underside of the affected leaves with loop to rule that out??? In that last plant pic, the pistils have a thick, mutated look... but could just be the result of light stress or heat stress, or mean nothing and just strain dependent...
 
Jimster

Jimster

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Promix (promix hp particularly) is extremely easy to use if you know the ph and ec everytime you water. ( synthetic based nutrients)

I use Promix with a little composted manure, wood ashes, and slow release general fertilizer and use mostly 20-20-20in 5-6 gallon buckets and have never had a problem in 30+ years. I typically fertilize every 10-14 days or as needed. I never really checked my Ph as I never had any problems. I water once daily with 1-1.5 gallon tap water (great water locally with enough minerals to prevent problems). As I mentioned, Promix has never let me down or caused any problems, except not holding enough water, especially towards the end and depending on strain. I put a catch basin under the ones that need more water and it allows them to take up the excess overnight.
 
brownred

brownred

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How are the plants doing now? IMO looks like a mag def. I’d flush and top dress with dolomite lime

They turned out great. I’ve determined it was light burn/scorched. The light intensity was turned up way to high.
 

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