Something wrong with my leafe

Anyone know what causes this to my leaf?

looks like its lacking potassium....yellowing...rust looking spots...probably the leaf tips are starting to or will begin to curl...give it a balanced NPK fert and check to make sure it dont start spreading to other leaves and you should be good

How much potassium do I have to feed it which npk do you recommend?

AKDOGG said:

How much potassium do I have to feed it which npk do you recommend?

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i myself stick with a 20-20-20..peters/jacks classic is great for that...and sells for a damn good price...i got the grow and bloom from them...both for around $16 shipping and all and the stuff last forever....been using what i have for almost 2 years now