Diagnose this problem

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Would you say this is a deficiency or early signs of nute burn? Grow medium is Coco half strength nutes ph kept at about 6.4. Any help would be greatly appreciated!
 
Are you using Cal Mag? Looks like the start of magnesium deficiency, at least to me.
 
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Would you say this is a deficiency or early signs of nute burn? Grow medium is Coco half strength nutes ph kept at about 6.4. Any help would be greatly appreciated!
That is called "tip-burn" and it is the first sign your nutrients are too strong for the plant. I generally start at 50% strength nutrients and increase weekly until tip-burn the back off 10%. So back off 10% and you should be good.
 
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