I have one MP40w ES on my 90. I usually use the Short Pulse Mode most of the time at around 80%, my SPSs look happy this way. But if I go lower than that, the flow wont reach to the other side. What is your favorite setting for your VorTech(s)? Do you change during the day and night? If you could include the size of your tank and how many pumps you run, it would be great!