Awesome bro thank you. I would have carried on at 6.7 and wondered why it was performing badly.Hey Bro, I'm running DWC and was running a Viparspectra led, just had a look through this thread, looks like you have everything set up nicely but just a couple things I would alter slightly, I think you said your res is 6.7 or 6.8? That's a good number for soil but a tad high for DWC, in Veg I try to keep it between 5.8-6.1, In flower I aim a bit higher at 6.5 and let it drift down but never below 5.6, also I would stop top feeding and let the roots find the water now, as long as the res is wicking the hydrotron you should be fine.
Good luck bro!
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What you said about top feeding make so much sense, the more i feed her from the top the more she will expect it and not go looking for the massive reservoir of feed 3" away haha.
Thanks again bro