I have 3 350 gyers clouds I had all 3 on the back wall and did not like sand was going everywhere. So I moved one to each end mounted high and I am running the SPS program on senergy app. And I then run the one on the back wall at random at 30%. I was still getting sand dunes so I had to turn down the power on the ones mounted on the sides. I also have to Neptune Wavs mounted on the back walls in the corners pointing out about a 40deg angle and running various patterns but only at about 23%. For now I am liking it but tank is new no corals or fish yet. Tank is 8x2x2,I am sure this will change over time. On smaller tank SPS I run 2 330s on the back wall with 1 mp40 on each end.