Indoor Normal? Lower fan leaves yellowing and falling off

Hey guys, Anyone have any suggestions about the rust spots at the tips?

Thank you
I had the same with a recent chemdogging auto, and I think it was p def and a touch of heat stress. I fixed with pk 13/14 on top of usual feeds

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Karl, do you know what the final ppm's are of your feeds? This looks like a K issue, the bitch of it is that both K defc. and toxicity look pretty much the same! ...So, tips on new growth look more or less OK, not burned, deformed which would indicate more general nute burn,... Any other K souces going in, like Si, bloom boosters, etc.?
 
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