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Yellow/brownish tips please help

So this is my first time grow, and I'm having a lil problem. I have a 3 week old fem. That is starting to get yellow/brownish tips I'm using a hydro system,cfl veg lights,sensi grow a,b52,and voodoo juice for nuts and i wayer anout 3 times a day for about 15-20 min i did a half solution for the first two weeks and then moved her into a bigger pot and did. Full nuts and the tips started turning yellow/brown so do I have nut burn? I already empty res and just put plain water in to get rid of extra nuts if that's what it is and moved my lamp up so it's about 6 inch from top. My ph is about 6.5 to 6.8 so what u guys think is it nut burn,over watering,ph, or heat stress or anything else that would turn tips of plant yellow brown and kinda crisp thanks Sorry theirs no pics
 
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