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#1
02-13-2012, 01:59 AM
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Uhh I am sure I can dig it up. But I think somewhere the point was lost.
The area 1-4" beneath the surface has enough oxygen to harbor the bacteria that convert ammonia and nitrite. Rock that is dense enough or porous and large will have an anoxic zone in the center where nitrates are converted into nitrogen gas. And yes if you have sufficient surface area in your tank covered in bacteria, that will act as a bio filter. That is the whole point of bio balls. 
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#2
02-13-2012, 02:37 AM
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I suspect the anoxic zone begins much closer to the surface. IMO the bacteria living in the top layer of the rock would use up the oxygen very quickly. I've always had 0 nitrates with my porous, thin, loosely spaced rock, and I like tons of flow.
I'm not sure if any studies have been done on the distance oxygen penetrate live rock, but it would be interesting to find out. Where did you get 1 to 4 inches from?
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#3
02-13-2012, 05:27 AM
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Well first off you need a very fine sandbed at least 3-4 inches deep to start getting Anaerobic zones. I have seen live rock so porous it almost puts crushed coral to shame.
To say "Heavy, dense rock, whether it's live or dry is useless, and will just lead to frustration with your nutrient levels." is much more of a stretch. Depending on who reads that advice it could be taken the wrong way, when using really dense rock like tonga branch is fine. Last edited by FitoPharmer; 02-13-2012 at 05:30 AM.
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