I have a 305 and 405. I've never seen a 404, but it seems that they are pretty much the same. I run sponges on the side, ceramic rings in each basket. I don't run carbon in any tanks, and don't run polishing pads either.
I clean mine every other week, and I'd suggest you do the same. With those fish, they're pretty messy. Nitrates will jump quickly in canister filters.
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