I need help

What wrong with my plants my ppm 1200 and ph 5.8 I use ganeral hydroponics nutrients expert program with 600 watt mh !!

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I thought cannabis liked the 6.2 to 6.7 range or roughly around that

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Ph is on point but 1200 ppms at this stage of life is too high … that needs to be cut down by at least 50 percent