Chillers flow isn't that critical, they usually recommend something Like 500-2000gph, or something like that. As long as u have a decent ball valve to adjust the output on ur manifold, u should be fine.
I have the sp6 on my tank, and it's a beast. I plumbed it legit, with all 1.25" PVC. I think that helped reduced head loss, so the flow is insane. I have it running my calcium reactor and a gfo reactor, still plenty of flow left over.