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If you tried mud, you would want the mud at the top, not the bottom. But then again, if you did mud, you wouldn't need any sand either. 2" of MM can be used in place of 10" of sand.
For those that are ready to ditch their RDSB after the 2nd year, keep the top 2" of the sand layer and pitch the rest. Reseed your new bucket with that at the bottom and cover it up with new sand.
I've been running RDSB's for about 6 years inline with other eco filtration, such as LR tide pool with filter feeders and a tidal algae zone.
My typical set up is...
Tank -> Mechanical Sump -> LR Tide Pool -> RDSB -> Algae Tidepool -> Tank.
The ability to ditch the DSB and start from fresh every other year is really nice.
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My opinions and views do not necessary reflect the views and opinions of my employer.
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