nut burn maybe?

I have a plant that's leaves are curling up and turning brown at the tips. Can someone please help me determine the problem and correct it. Thanks
 
On the lower right of the reply screen is "go advanced". Click and the manage attachments. U can upload then from pc.
 
I'm gonna cut back for sure, only one out of my six are having those issues. I'm still in process of loading a pic. Besides that issues defintetly would like some feed back on my first grow so please take another look at my thread in a couple of hours, I should have pics uploaded by than. Thanks
 
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