I should be getting my canister at the beginning of next week so I will be moving some of the used media from my overhead sump to it to get started. I may use the sump on the new tank but it's kind of an eye sore unless I figure a way to hide it.Not sure of the comparison, but I'm running 2 Emperor 400's and 2 Rena XP4's on my 150. I have very messy fish, and slightly overstocked as well and they do a good job. If you run that one Emperor 400 and even one canister right now and stock lightly, you can take a bit of time to but more filters and your fish grow or you buy more fish. Nobody can really argue that a 150 gallon with 5 medium sized fish will do better than the same setup on a 55 gallon tank. Water volume helps a lot. Move some used gravel over and filter media to make it easier to switch everybody over.
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