I run 2 - XF350 on each end of my custom 92" x 36" x 28" center reef along with 2 MP60's and a 4000 gph return pump on an Oceans Motions 4 way motor valve. the XF350's were my last addition and the difference how clean the sand stays with the XF350's is a world of difference. The surface agitation is unline any of the other pumps, able to run these right at surface level. Very impressed, they ramp from 30% - 100% alternating each other.