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Cotyledons turning white-ish and curling down for no apparent reason

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    HYDRO Cotyledons turning white-ish and curling down for no apparent reason

    So as my third or fourth grow, I thought I'd turn hydro because I'm just sick of the fungus gnat problem. I treated myself to a GHE Aquafarm (45 l), bought some special hydro nutrients, a PH and EC meter, and got started with Royal Hulkberry Automatic.

    It is my second attempt to grow hydro now, I use (pretty alkaline, around 7-8) tap water as a basis and (organic) PH Down to keep the PH in check. The first time, I failed because I didn't check the PH regularly enough (once a week), the growing plant (only cotyledons + 2 leaves) just turned violet-ish and died off because the PH was simply too high.

    This time around, I took care of everything: with tap water as a basis (+ nutrients so that I reached ~500ppm above the base value of the tap water), I check PH regularly and keep it around 6. Like last time, however, there are white-ish spots on my cotyledons and they seem to die off again? I suspect that the high lime content of the tap water may be the cause, but I'm not sure. Instead of just waiting for it to die off - does anyone have an idea what could be the issue here? See the photo below. Thanks in advance for any advice! I'm clueless since PH is fine, EC/ppm is fine, lighting and temperature as well...anyone else had similar experiences?

    (Hope you get the idea, sorry for the bad picture.

    If the first true leaves are ok, i wouldn’t worry too much about the cotyledon leaves dying off. The true leaves should be taking over the workload of feeding light to the tap root.
    There are 3 things you must check everyday when growing in hydro:
    1) Water level (How much h2o is she drinking in 24hrs)
    2) pH level (change over 24hrs)
    3) ppm/EC level (How much food is she eating in 24hrs)


      Try some spring water. I get mine at walmart about 65 cents a gallon. Ph is always right at 6.0.(but I check it anyway).
      That will rule out your tap water.
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