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Let me throw another monkey wrench into the equation. Mass is not equal to weight. How much mass (or volume) a 1 lb piece of rock occupies is highly variable. We all know this. But how much bio activity does it impart and what type is another issue. The more porous the rock is the more room there is for "aerobic" bacteria there is. The denser the rock is the more area there is for "anaerobic" bacteria colonization there is.
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This does make sense to some extent, but what I really wonder I guess is how much live rock do we need for a sufcient amount of anaerobic bacteria to grow? I know there isn't an answer for this since there are lots of variables. But I think that was really what I'm trying to lead to. How much bacterial filtration is necessary for a reef tank with x amount of biomass in it?
Again no single rigt answer here, but something to chew on.