We finally got the PH level down to normal. Our PH has been running extremely high for the past few weeks. Today the initial reading was 8.1 and after trial and error of adding more nutrients, the final PH in the new batch of water read 6.4. The plants should continue to grow well. They finally have a normal PH reading because it is slightly under 6.5 and our lighting is still set at 18 hours a day.