I have always wanted a dsb but once I read about the turf scrubber I went that route instead since it is a little "safer". It all comes down to removing nitrate from your system. We all know the nitrogen cycle and how it works. The part we as reefers get stuck on is the nitrate. Our systems do not allow for nitrate to be broken down unless you add something of the sort such as a DSB. I remove nitrate through the rapid growth of microalgae in my turf scrubber and someone with alot of room can also do this with macroalgae such as caulerpa and chaeto in the fuge. The only downside is you need alot more room since its growth rate isnt as fast as a micro.

I even remember the short lived- clam fuge tank. That would have been expensive! Lol

Oh and one last thing- I've read that DSB are kept best with very high flow going over the top of them to reduce the possibility of detritus getting down in your sand bed.