Brown and yellow tips

I'm using tiger bloom and I have it some.magmesium and calcium it's last watering hoping to stop it the Browning hasn't gone any further on the leaves since I did that
 
So i did my research and the only thing I see similar to what my plant is showing is what you said the potassium deficiency because my old leaves have a rust color and it's down the teeth
 
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I've been doing only one teaspoon of tiger bloom that's what i thought to
 
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