Max flow from 2" inlet?

[Spyd]

You are better off reducing that 2" pipe down to a 1" pipe. 2" will cause a lot of pressure required from the pump to push that much water. Running 2 pumps would cost a lot of money. How big is your display tank? I recently purchased a Water Blaster HY10000 pump. It moves 2600gph of water and is very energy efficient.