Thank you so much for the info.You have been a wealth of information. This system was given to me and I gave it back and it still came back so I figured I would try it for one grow to see how much of a pain in the ass it would be.I have always grown in soil mediums with fantastic results, but since I really have no investment in this setup I figured what the hell?I've always been fascinated by hydro systems but have never really had any meaningful hands on experience with one.Thanks again for your help and suggestions.