If this is a reef tank, then don't have the cannister running with the media all the time because the bags of media can become nitrate factories. I ran an Eheim ProII 2026 on my fowlr & it was ok because fish are less sensitive to nitrates than corals. You'll still have to keep up with water changes to lower nitrates though. Cannister filters are also good for added circulation so the higher the better IMO.
Anthony
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