Possible Potassium deficiency?

Updated pic
  • Still having issues …errr… about 3 weeks later. She is the back right plant, grown some that’s forsure.
    Hoping she will live long anough to finish unless there is any idea.
    temp 73f
    RH 51%
    ph 6.3 just upped today to 6.7 to assist the calcium uptake I hope.
    currently feeding a total of 820ppm in Rez of Autopot system
    5liters 3ml cal/mag and 6gm Megacrop.
    The younger plants doing well with the youngest on it’s own Re.

    This is my first Auto grow so she has been used as a learning curve.

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