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You mention the worry of the deeper areas lacking O2... isn't that the point? The bacteria which break down the nitrate live in areas with no oxygen.
The lack of surface area is something I would like to get more opinions about though. I'm wondering if this is even going to be worth it with 150g worth of water in the system.
FWIW, I just went and measured. I have 7" deep of sand in a bucket that is 13" in diameter.
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One day I'll be so rich I'll have a closed loop and Tunzes to mix my new saltwater!
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