Heruk the pics above confirm it. We both have the same issue with burnt leaves. It looks EXACTLY like what mine have been doing. We need to figure this out!!! What are you using for oxygen? air stones? if so what size? I'm thinking its got to be a DWC thing. I was using air stones then i switched to aerators. The batch with the aerators sucked I had to harvest early. I just switched over to nicer air stones hopefully it will make a difference! Also are you using tap water? if so, what is the TDS before you add nutes? mine is around 190ppm with a relatively high 6.5-7.5 PH.