I have a 75 gallon comm tank and just purchased two 800 gph wave makers.i was just wondering how most of you have them set up.one on each end?all I have is a small air stone and have been having problems with cyno so im hopping this will help.i plan on getting a r/o system when I can.my tank has been up for a year and a half and only keep my lights on 7 or 8 hours a day