Having an internal water pump for that size of tank and lift will be like having a 150 watt heater in your sump running 24/7. Just asking why are you stuck on internal? Something like a Pan World 50-PXX is quiet and uses air to cool the pump instead of the water. On a 75gal with a tall stand I used a mag. 18 with a 1" drain and a 3/4" return. I used the pump externally. One word of caution some companies will not warranty mag pumps if you use them externally.