I actually have 2 Seios and 2 powerheads. I was running bothe seio 110's at the same time and injecting random powerheads. Now I am running just one Seio because I am experimenting with stuff.
What I am ruinning into is I have debris kicked up (which is good) but I also have some sand movement. I haven't quite nailed down how much is too much. If they were all running and the seio 1100's were not adjusted down I would have 3600GPH not including my return pump in a 65 gallon tank (55x).
As it stands I have between about 700 and 2100
GPH depending on the randomization of the powerheads. About 32X what is everyone elses turnover?