Trying to pick the right return pump

[viperfish]

A high flow rate will mean you can branch off the return and drive other things such as media reactors. I agree with BlueTang<3 about throttling back a larger than needed pump, it allows you control over the flow. I'm a huge believer in keeping the flow below the rate the skimmer can process, you don't want water ripping through the sump and back in the tank without skimming/cleaning first.