That would be adequate. Just stay on top of your water changes and use some Purigen. I'd actually put a foam block/sponge topped with filter floss and Bio-media in one filter, and put a foam block with a micron baggy of Purigen in the other. I don't normally put the bio-media in mine since I have heavily planted tanks, but for messy goldfish I have to recommend it. I just use multiple foam blocks in my ACs.
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