NEED HELP. PROMIX And H&G

Hey all! Looking for some help. I have an issue that is plaguing my whole garden. Plants at dif ages and dif feed strength all with the same issue. Pale leaves on the whole plant and purple lines in the stems. Im in promix feeding drain to waste with house and garden aqua flakes with 5 ml of calmag ph going in is 6.3.
 

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