I'm pretty much new to growing. I have not grown in about 15yrs when I was a kid and just recently decided to give it a try. I'm growing in coco and buffered my coco and took the step to prep it. I noticed some discoloration in my plant not sure if it's potassium deficiency.
Propably magnesium. If you can foliar spray her for 5 days with epsom salt. 1 tsp for a liter of solution. This will help you to identify if its really a magnesium defficiency before changing her nutes in the water.
Also idk if you are watering correctly since these signs could also be because of a root problem, like too much water / too little oxygen, a too small container or bugs lile fungus nets.
I'd say more so magnesium vs potassium.
Check out this leaf chart to help pinpoint issues.
https://420life.com/wp-content/uploads/2021/10/Marijuana-Leaf-Deficiency-Chart-scaled.jpg
Good advice about checking out CaMg, just Mg can use epsom salts, as I don't see any issues with Calcium.
Good Luck!
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