anybody help me?? leaves going brown at ends and dying

Heres the pics
 

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Here's abit more info its grown in soil and perlite 50/50 ratio...its growing under a 300w actual draw vipar led...its currently 16 days into veg
 
I'm also no expert... but from the pictures it looks like the bottom leaves are touching the soil. If you are using nutes and the leaves are touching the wet soil after you feed, they could be getting burned that way. Just a thought!
 
No the leaves were att nice and stright...then they started drooping and then they started going brown at the ends...so u guys think its nute burn? I havent fed them anything but water and the soil i use hardly has any nutes in it
 
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