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Top half of the plant had yellowing leaves so I figured it was a nutrient lock out which I ended up figuring out from my run off ppm levels that I think I was right. All input is greatly appreciated tho. I'm a newb so I can use all the extra help I can get

Im about two weeks out from harvest judging by the trichroms. I'm using a salt based nutrient line from my local grow shop ph of the soil is 6.3. I went ahead and flushed with straight water and I just found the problem. My ppm' are way way way to high lol at 1900ppm's ph was fine still some...

my top leaves are all turning yellow my bottom ones are not. I'm guessing this is a nutrient lock out problem? Or maybe because my humidity dropped down kinda low for a few days (30%)? so going off the little knowledge I have I was going to go ahead and flush but I'm scared to go three days...