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I think it's the lights are too low. And is there a such thing as too much cal mag?

Ok I'm in my 5th week of flower newbie here.1 plant leaves are turning purple on the edges the other has brown/copper spots. Now I'm making sure water/nutes are ph'd and the other day I checked the run off which was 6.6 which I read is fine. I don't use the recommended dose of nutes the bottle...