I would go with the fx5 just because ive had good luck with them but I never had cfs before so cant really compare.... I am not sure if I miss understand your first post but I would keep the marineland hob running in addition to whichever canister u end up getting.
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Oh sorry iPhone has spellcheck but I meant those hangover filters they take too much room in the tank and my aro keeps attacking them knocking them to the bottom...
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