Anyone know what this might be?

Would anyone have an idea what this is or what might be the cause ? Only effecting one plant at the moment.

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Thank you in advance.

a quoted post from my current journal. This is after a flushing two days ago and like I posted its only effecting one plant.
 
Calcium or phosphorus deficiency. That is definitely not nut burn. Make sure that the P.H. at the root zone is correct 6.2-7 soil 5.5-6.2 hydro. If it is off this will cause your plant to not absorb nuts right. Flush with P.H.ed water with the proper nuts and you will see this stop appearing on new growth within a week or so.
 
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