why are my leaf tips like this??

What is happening to my plant??
 

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Picture one and three look like K defs. Picture 2 looks like N def + either cold temps or low Phosphorous levels. possibly caused by some sort of pH issue since it's so many things.
 
The yellowing in picture 2 makes me doubt it's a nutrient burn, but a second opinion has never hurt. what's the pH of your medium looking like?
 
your big fan leafs will turn yellow and die.
Look at the other green growth. I see leaves curled under, and dead leaf tips.
whats your PH at? How much you feeding them.
147050d1184547361-deficiency-chart-defects.jpg
 
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