Hi
I think I may have figured out why my fan leaves are turning purple/yellow and dying off in week 4 of flower..when I transplanted into a 3 gallon pot, I made my transplant hole and added (fish bone meal 3-16-0)and (fish meal 8-3-0) from down to earth...All through veg my plants were fine..2/3 weeks into flower my fan leaves started turning yellow and sone even turned purple..i flushed them and even treated them with neem oil but they stated getting worse..I think there not getting any potassium the flower have stopped growing..can you recommend a stand alone potassium supplement that will be available immediately..
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Here's an option: https://amzn.to/3mRmQZa
A couple of things in the Articles. Hit up your hydroponics store and request a PK Booster or these if they don't have it.