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Yes take all readings before you make changes, Make any nesessary change and retake reading. That way you know what your plant is doing.
Stop adding stuff for a couple of days, just monitor and adjust pH. Your problem sounds like it could have to do with your pH, swings of .5 - .7 daily is not good. Again try and get your nutrients stable. Also, reduce your resevior water to 70 degrees, 76 is a bit warm.
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