[mike31154]

2MP40s should work nicely for you. I run 3xMP40 on my 4 foot 77 gallon Hagen tank. They are in a master/slave configuration running in TSM. Two on the end glass are limited to 80% speed & the one on the back glass is limited to a lower speed because tank is narrow, 16 inches back to front. TSM runs all 3 pumps at varying speeds over a cycle of several hours for random flow patterns. With a single button push on the master drive, I can switch to NTM (short pulse wave making mode) which I like to do prior to water changes. You'll need to tune a wave for your tank first, for optimal result. Single button push again on the master, reverts back to TSM. Speed variations in TSM are gradual, keeping noise to a minimum. I also use Night Mode to slow all the pumps overnight, more for power savings/noise reduction rather than any attempt at recreating what actually happens in a reef at night.