This stood out in my mind...
Quote:
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The problem with the life in the sand bed is that acording to the good Dr. Ron (who started this sand bed craze) we can only support 10% of the number and viriaty of "bugs" that it takes to make a sand bed work properly.
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What he didn't tell you that has been recently dicovered is that the 10% of those "bugs" account for about 85 to 90% of the denitrification process, all of which occures withing the first 3/4 inches of sand in an aquarium.
I'm not taking sides with the issue as I almost went bare bottom with my new tank. Instead I went with a 1 inch bed and utilize a diverse cleanup crew. I enjoy watching those little guys almost as much as the fish, thus I have placed more importance on a sandbed.