Plants sick in flower

First thought it was calmag, then maybe root rot, but now I’m thinking phosphorus? Any help would be greatly appreciated. Checked the ph of the soil and all 3 at 6.5.

I say you were right on the cal-mag,that dark leaf is looking rather glossy, makes me think nitrogen toxicity. I grow DWC, so I can't say to much about soil. If I saw even a little shine coming from my girls they get a fresh tank with no nutes to flush them. A heavy distilled water flush would be my advice,
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Thanks man I hit em with straight water for the next week or so see how they turn around