[Panoramix]

So my tank has a mix of LPS and SPS, a large yellow tang, a large hippo blue tang, a clownfish, 2 neon gobies(?), an urchin, a sea apple, cucumber, a cleaner shrimp and 2 blood shrimp.
I do a 20% water change every other week and filter maintenance every month.
A friend of mine is moving and giving be his 200 gal mixed reef with a overflow sump setup.
I'm looking at building me a basement sump refugium large enough to accomodate both tanks at once, and splitting the return to both tanks. Here is the challenge. The 200 gal tank will be in the basement, and my current tank on the main floor. Should I get 2 return pumps? split off just one?

Sorry about the long intro.....figured I'd let it all out there