Not that I'm trying to defend or dispand any theory, I haven't quite decided on the issue yet. I just need to clarify something.
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The 1- X inches of sand that you have on the bottom of your tank isn't the ocean floor and doesn't function as one either.
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In fact 80% of the denitrification process of a sand bed occures in the first 3/4 of an inch of sand. If you were to ask me if a sand bed is the most efficient way to denitrify water I'd say no, water changes are. The ocean doesn't have that option though. If you asked me if a tank would stay cleaner without a sandbed I'd say yes. I haven't experienced the issues many others have in keeping a sand bed clean. I've always focussed on having a big reef crew. Ask me on moving day what I'm going to do and I'll still be undecided I'm sure.
