I think that a lot of us have fuges as part of the sump as getting one that is properly set up as Steve says that overflows into your display can be challenging as far as getting it set up and not look either funny or butt ugly. My experience with canister filters has not been great - they tend to get clogged up and require a lot of maintenance and also seem to really lose their flow so don't know how much I would count on that as a closed loop but if you can keep it free from sludge build up you might be fine. Baffles are not going to slow you flow down but may work well to make the air bubbles pop before getting to your return pump.
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