Have a look on our calculators page Marine Aquariums of South Africa calculators There is a link there to work out how much sand is needed for a DSB, just enter your measurements and it should give you a rough idea.
I have 9 cm in mine, I has been running for about three years, the live rock column is above the sand bed supported by 3 PVC pillars that are placed on the base to stop any chance of falling over.
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