| Re: Inclinations of a no-filter media system.
cryptic sponge filtration...the creation of a separate 'refugium' in which a cryptic (ie. absence of light) is encouraged. Unknowingly aquarists create these environments on the undersides of live rock ledges where these sponges grow, but if a natural filtration method is what you seek then you will have to build the refugium and expand on it by placing a large quantity of these sponges as well as other filtering organisms such as sea squirts.
Stephen tyree is the mayor proponent of this system (he calls it the environmental gradient zonal approach)..theres tons of stuff on the net about this, some of it is over the top..I found this one for you, seems to be the most 'straight foward http://www.practicalfishkeeping.co.u...?article_id544
whew...finger cramp 
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