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need help leaves turning black??????

this is my first grow im doing it in a hydro system, and using a 250 watt hps light for flowering. its on week 3 of flowering and on one of my plants the blue hash one, some of the leaves started to shrivel up and turn black at the edges. i wasnt to worried about it but now more are starting to do it. all the other plants are health and show no signs of this so if anyone could help that would be awesome .
 
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