Yes, I do have a powerhead it is a Koralia 1 in the right back corner. I put it there because the mag flow in not in the center it is off the to left, and that is where the flow void was. The way I have if figured it: Little Giant 700gph, and Koralia 1 400 gph
, That is just at 15.2 gph
circulation. AA folks suggested 10-20 gph
times the tank size was best in a reef tank. Does that sound right to you? About 30 more gallons below in DIY sump and refugium water. With a smaller pump to pump into the refugium and then of course a skimmer pump (mag 5) I do not know if those count in the whole movement picture or not.
The rock: Because we went 300+ miles to get it we took rubbermaid totes, and totally underestimated the amount of rock we would need (plus I did not realize the cost, $7.99 # and it was not quite done curing). Once we got back home we realized it looked like a drop in the bucket so we went to Petco here and all they had was fist sized rocks. They would have looked silly. So I ordered 30 more pounds of figi large show rock and some rubble from Dr. Foster and Smith, supposed to be here today but we have a nasty little spring storm going on with a couple inches of snow on the ground this morning. I hope it makes it. I may even order more after I see how much that fills the tank.