Overwatered reason for droopy because ur pot is huge and after u water plants or flood it takes days to dry out again, so ur roots never have to grow and search for damp soil.
Plastics, medication people flush down toilet, chlorine chloramine fluoride blah blah blah but mainly less ppm of nutes in flower. Zero ppm of that stuff with added CalMag and nutrients
As long as your aware your solid Alctrz8849. Your are very correct about stability in tap water but you also have many things in tap water people are unaware of.
Well make ur nutrients recipe and test it with that air stone and see if ur Rez ph raises too fast if it does then that’s too much aeration. Some nutrients prefer water movers over aeration.
Vapes are being fazed out.
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So I had that on my plants when I used a new nutrients company and I wanted to see if I needed CalMag and when I saw that blocky splotches on my plants I added CalMag and never saw again with keeping 200 ppm from CalMag using reverse osmosis