Hey mate, I read your cornern about water temp. I know you won't read it anywhere but from my experience you can easily go on with 27°/28° celsius in DWC but make sure to have a big air pump. That allows roots to get enough oxygen. Moreover you're using Hydroguard that helps and I saw you're using h2o2 too (if don't, try with 1 ml/l). In my first crop I had 27°+ in Dwc but thanks the air pump and h2o2 everything was fine
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