Fullpond, I have the same system except i am running 2 diffuser banks with 3 diffusers on each. one in 15 foot of water and one 5 foot below my dock on stainless steel cable (keep the ice fromk forming around the dock in the winter). I have a set a valves in my compressor box on my dock to control the air-flow to each set of diffusers. From what I was told and gathered on my own is that you want to run the summer diffusers in the deepest part of the lake and the winter diffusers in 1/3 off your deepest spot. Just make sure you do the propper start up on the aeration sytem to get your fish use to it
A weeks worth of vacation, 59 hours in a John Deere 160, 2 logs of Skoal, 1500$ in fuel, Lots of help from the neigbors and my old man, and a wife with an open mind to let me dig a pond at are cabin. All i can say is life is good!