OK... so I'm guessing you don't have a python. Do you already have the hose to do this? I'm guessing the run FROM the tank won't be sped up much. Because at 200gph, that's only 3.3 gallons per minute. Now on the return. Coming from the bath tub will be slower than the sink. Because it will have to push the water approx. 4 ft up. Compared to 1 to 2 ft up from the sink. This is where you need to know the specifics about the pump. A 200gph pump might only pump 100 gph 2 feet up and 50 gph 4 ft up. Some are made more for Flow(almost lvl movement, like a power head in a tank) and some for Pressure that are good for pumping Up for fountains and stuff.