In my 5' x 2' x2' tank the two MP40's (on either end toward the front) ramp up and down over the course of a day in reef crest (anti sync) mode, 30% 0-7 hours then 40% 7-11 hours, 70% 11-15 hours, 55% 15-18:30, 40% 18:30-22:30, 30% 22:30-0. I also have 2 jebao WP25's ( one on each side toward the back) running anti sync pulse 20-30 sec at 60-70% power. There is a pretty good amount of flow, but I plan to crank it up a little more and try to vary the modes and speed from time to time.