My opinion would be get rid of the sponges (foam filters)and fill the thing with live rock gravel. You'll find all sorts of stuff will grow inside your filter, I'd keep the live stock like tube worms, sponges and tunicates that grow inside the filter, some people kill it off but I figure if it's a filter feeder it's removing crap from the water like the foam filters but it's consuming the crap not just trapping it so it can break down. (run on sentence or what?).
Doug
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