In my 200 gallon penninsula tank I have an AI Orbit 4 on one and and two AI Nero 7's on the other. The orbit 4 runs at like 70% during the day while the 7's run at around 50%. The tank is 6ish months old so none of the corals are very big and that whips them around pretty well. Have been experimenting with turning the flow down to a constant 25% at night. Anyone else do something like this or leave flow the same during the night?