03-02-2012, 05:05 PM
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Bio-balls are only really suited for wet/dry applications and don't really belong in canisters.
Porous ceramic bio-media should only be last in a filter or next to last followed by filter floss for water polishing. You don't want detritus plugging up the media. The EfSubstrat non-porous ceramic media is something else that only Ehiem filters use as a course pre-filter. It should not be confused with ceramic bio-media.
Typical setup is foam, chemical adsorbant (activated carbon, purigen - optional), bio-media, floss.
For bio-media, Bio-Max or Matrix are good choices for canister filters.