Not sure about other types of pumps, but for your tank, dont rely on the return pump doing most of your water flow, or you could end up with microbubbles if your turn your sump over too fast. (can be solved with lots of baffles potentially, or a larger sump though)
If would use something like a mag 7 for your return pump (depending on sump size) then put a larger pump on a closed loop, like a mag 9 or 12, depending on head pressure. Aim for 15x total flow IMO.
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