Fast and vast auto cfl

Hey guys an girls I have a fast and vast under cfls, (saving for LEDs). 7 and a half weeks old now.

I do think I have a nutrients problem. I know she has slight nitrogen claw but the leaves keep on getting black/brown blotches on leaves and have dome shrivelling and dying! :( Also was curious about the top cola ,is it normal to branch like that? Will upload pics any and all help and tips would be great! Thanks
 

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