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Is this Potassium Deficency?

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This is my first indoor grow and so far its been OK. I'm at Week 5 of flower now and the lower, older fans are showing signs of nute deficiency or excess.


I'm growing in Canna Terra professional and been feeding it bloom nutes with some boosters for Vit-B and potassium/phosphorus


 I feed every 3-4 days, temperature seems fine between 20-25c, ventilation with exhaust and oscilating fan, PH on the run off water is 6.3.


Is this deficiency or excess? Looks like something with potassium from other photos online...Am I correct or is it something else?


Also, what can I do to fix it? The other leaves on top look fine and the buds are looking quite healthy.






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