Ok I've never done dwc with top feed first timer. Day ago around five am my lights went out. Theve been on 18/6 day after I fixed lights leaves are yellow and Browning. I have been using to water testing at 125ppm and was 7.1 ph but lowered to 5.69 ph I need some help I have already lost one earlier wasn't using any nutrients what is going wrong also room temp around 75-80 using cooled 600watt mh