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I check pH daily. Min 5.5 Max 6.6 Average 6.01 Current 6.0 Thank you for your prompt reply.

On my first hydroponics grow. In the fourth week of flowering. Ebb and flow using hydroton and LED lights. Four White Russian plants. Three are very healthy but one has many leaves as in the attached pic. I've checked many threads but am not sure why this plant is browning. Suggestions, please.