Lemon lush and lemon diesel issues please help

The kush and diesel are both several weeks into flowering and recently the kush began to develop curled, burnt looking leaf tips and minor burns on the serrated edges starting inward moving out. The diesel has an orange reddish covering on a good percentage ofher leaves. Grown under a 750w Mars LED in happy frog soil with Buddha grow RO nutes. Watered with ph'd spring water.
 

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