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Originally Posted by Misticl
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There are a few factual errors in the article, but carbon can be useful as a filtration media. It's not clear how much it can remove.
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IMO the deeper the sand bed will just set you up for deeper problems later.
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A deep sand bed requires some careful stocking choices, but I ran one for a bit over 10 years. The sand was completely fine after that period of time, and I would have kept on running the tank if I hadn't had such a difficult work travel schedule.
If the tank is stocked with animals that kill the sandbed (goby fishes, "sand sifting" starfish, etc), it won't function, and if the tank gets more food that it should, the sand can become a mess, but deep sandbeds do support some interesting animals, and they might help some with filtration.