07-28-2009, 07:51 PM
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The size of the aquarium does not impact the effectiveness of a deep sand bed (DSB). The key to an effective DSB is the depth of the sand. You should use at least 4'' of sand, but no more than 6''. You will find in your research that most people who do not have successful experiences with DSB systems are not following this guildeline.
For the record, on a DSB system, the sand should be placed directly on the bottom of the aquarium. No plenum or dividers should be used to separate layers of sand. There are many references on the internet to plenum style systems. These are also effective when set up correctly, but can not be "combined" with a DSB. These are separate concepts and need to be treated as such. Be certain not to intermingle your knowledge of the 2 systems. Most importantly, a DSB requires sand sifters, such as hermits, snails, starfish, etc.