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Yellow large fan leaves

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    Yellow large fan leaves


    So I got up this morning and saw this, yellow leaves seem to be the large lower fan leaves are yellowing. Her is what I have going on.

    Grown in 3 gallon bags in fox farm happy frog, using gh floral nova series(bloom) at half strength. Been adding Calmag 1teaspoon per gallon, grown on auto pots. pH going in 6.25 ish temp at night in low-check it everyday it goes up to about7.2 in the next day. I adjust it daily to try to keep it between 6-7. Tent is 4x4x8 vivosun 420 watt led light about 16-18 in above plants temps at night lower to mid 70 during day with light on 82-84. Did get a few hot day it got into the upper 80s. What am I missing here.? Think the pH fluctuations is causing the yellow? Do have a few yellow flecks in some leaves too.. I noticed I have some painted nails on the tips think the nutes are still too high.i have been lax on ppm tracking. Couple times I did check were running about 1200-1300 too high? Any advise

    #2
    Is that Fox Farm Happy Frog a Coco blend? If so, I keep my coco pH a little lower, like around 5.75 and full strength nutes at this flowering stage. To me, they look hungry and the pH might be locking out nute absorption. If it were me, I would flush with 5.75 pH water and make a fresh batch of full strength bloom nutes and apply. My two cents.
    SF 2024 series 2x2x5 full kit,
    Coco coir/perlite
    General Hydroponics Flora trio plus CalMag
    Seeds from FreeWorldGenetics
    Gardening for 40 years growing for 3.
    "Yes, I am a shrubber"​

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