I wanted to add some more flow in my tank. My question is this. If using an external pump (eg. something similar to the little giant pump) can I place the pump under my tank in my stand and it function properly by sucking water directly from the tank (about 4ft-5ft up). I know all pumps are not the same, but on average, if it cannot suck from that distance, what's the maximum distance an external pump can usually suck from.