I have fairly high flow through my sump and run a fairly large skimmer (MR3), and without baffles, microbubbles would definitely be a problem. My skimmer is external but over the sump, so it doesn't take any room up yet there is no fear of a flood. My sump is 70g tank with a return section (13g), refugium (20g) and drain section (20g). The drain section and refugium have live rock in them.
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225g reef
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