Thanks all! Yes I re-visited the control bucket idea and did indeed go to a larger container, approx 10gal, which makes me overall around12-13 gal. I think that a larger controll res' should provide a more stable mix and make the ph and nute' mix easier to control. Ph is now running around 6.1-2... and I'm changing from Pure-blend to Fox Farm Grow Big...just to experiment. Overall i'm satisfied and just waiting untill they get to around 12" before going 12 12..What do ya think??