These questions and answers are for research or archival use only. There
is a wealth of information here and I encourage you to search the areas. For
the latest information and to join an active forum please click below. Badman's message forum
I always prefered a DSB. First is simply the aesthetic appeal, especially in a reef setup. I've personally never used a bare bottom in a full setup, but I can't imagine that is looks very good. More importantly, a DSB houses a vast array of creatures that help regulate a stable tank. There are creatures like bristle worms, copepods, and other things that break down waste and organic matter. Many of them get there by themselves through live rock and some, like narcissus(sp?) snails and starfish, you can add to stir up the sandbed and further break down organic matter. The upside of a BB tank is obviously easier maintnance, as it's simple to see when your tank bottom needs a good siphoning, but it just seems to me you lose a lot of valuable surface area for bacteria and cleanup critters. Then there are little things that a DSB aids, like anchoring rocks, housing food items (copepods, amphipods, etc) for fish like mandarin gobies, and allowing anchoring places for various corals.
Well, that's my 2 cents
-PatMy tanks and vivariums---> http://community.webshots.com/user/patm7