Dark Devil Hydroponic

Apr 17th - pH 5.7, PPM 450, 0.9 EC, 75f, 65% humidity - I changed the water, and lowered the nutrient amount, the leaves look awful, and tbh I've always had issues growing Dark Devil :( Why must beautiful plants be the hardest? Trying to salvage it. Apr 18th - x Apr 19th - pH 5.8, PPM 440, 0.9 EC, 80f, 35% humidity - I think it may have been the humidifier running on my city's high PPM tap water that may have caused the issues. Since lowering the nutrient amount to half and not using the humidifier, the new growth looks good while the leaves that were already messed up have pretty much died. I'm hoping this was the cause of the issues so we will see how this rides out for now. I am also looking into getting a water chiller, as my water stays at about 80f. Apr 20th - Apr 21st - Apr 22nd - Apr 23rd - pH 6.0