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Rockwool runoff @ 7pH... HELP

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    HYDRO Rockwool runoff @ 7pH... HELP

    Hey there my 4x8 tent, using two 4x4 flood tables, irrigating using floraflex top feed to waste. My temp is 82 in day and 73 at night. Steady 60-65 RH.
    Currently in week 3 of veg (was going to flip but having some issues) in a sea of green. 24 6” Hugo blocks per light. Feeding for about 35 secs at a time which is about 100ml. Aiming for 3% shots.
    Drybacks over night is at about 50-55% by the time my lights turn on. Currently 6 shots a day, last shot @ 9AM and lights off at 11AM. Maximum moisture content is usually 67-73% by my last shot/feed. My ph is at 5.8 and my ppm is 950. Runing athena pro line, with mammoth p, silica and black strap molasses. However my runoff has been coming out at 7pH the past 2 two days.... plants look healthy, can’t figure out what it is. Flushed them using Athena cleanse and hardly dropped down, 6.8/6.7ph. Any suggestions or ideas as to what I might be having issues with or doing wrong? My reservoir is at 69-71F. Using ac infinity 6” for an exhaust with two oscillating fans and a clip fan. I have good air circulation, pretty dialed in environment. I can’t figure out why or how my ph can be that high.... oh I’m recirculating my reservoir with a water pump, to air-rate it without air pumps to AVOID rising pH... help please

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