I will be getting a Rena XP3 and Ehiem 2026 for my 135 setup. I read that for the XP3, it has to be setup 24" below the water level, but my setup does not allow this since my tank will be sitting on a ledge and I will be placing the canisters next to the tank itself. So it will probably only be 12" below the water level. Does anyone have any insight? thanks!