why are my leaves turning brown?

CdZc

Member
2 females, 4th week budding 12/12, one is beautiful no flaws at all, hope to put the pics up soon. but the other one is fading, the tip of the leaves are turning brown and curling, nothing has changed, i dont know what it could be. using 2 1500 lumins cfls and 1 1100, using 15 10 15 nutrients and watering once a day.
 
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