I have been using a fluval 401 with out any media in it to feed my sump on my frag tank as is not drilled and I did not have another pump kicking around.
It took some time to get things balanced, but it has been working for a couple of months. Just use a butterfly valve or the ones that come with it to control the flow. I dont run any media in it because a filter sock is easier to change and it wont clog up and decrease the flow.
Best of luck with the new system.
Andrew
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