All,
As you may know, I am a big believer in DSB's BUT after all my reading and belief systems challenged, I designed and set up my in wall 180 with a SSB (becuase I like the look) and a remote DSB (this was after long conversations with Shaun and many other reefers here).
I get "the look" I want, and homes for the critters in my tank who constantly sift my sand all over the tank.
The DSB is in my FUGE (here ya go INk) and is about 4" total. I also have a few snails, crabs and recently added stomatellas who are breeding in my frag tank (go figure). I also have probably 20lbs of live rock, rubble etc. This sand bed was seeded from my old 92 corner display as well as 10lbs of GARF grunge and some sand from fellow reefers.
Pro's -
1) I get the look I want in my display without the possibility of crashing
2) I get a place for my favorite critters
3) I get the benefits of a DSB
4) I get the benefit of easily replacing the DSB when it gets close to its life expectancy
Cons -
1) You will eventually have to replace the remote DSB
2) you don't have alot of sand in your display
3) since it is a shallow sand bed in your display, if it gets moved by power heads, animals or the like, you have some bare bottom anyway
Hope this is helpful
House