Dive thanks for the photo I love that setup. I am sorry I am lost when it comes to ppm I also use the 3 part GH nutes I just follow the charts given. I do not check my ppm only my ph. My hydro store tells me just follow the chart and don't worry about ppm top off with ph water when levels drop. My plants look great-thick stalks and very bushy I am sexing to see what I have. 2nd day with my clones and looking great right now. Failed twice so far. I think I got it now though. Thanks for the help. I have them under a dome and backed of my fluorescent lighting a bit to about 6". Misters and air stone going 24/7 with my Olivias solution ph 5.5-6.0. No wilting and very perky. I need this to be successful this time around- I need some bud soon.