I have a BB setup in my 100 gal atm and considering what to opt for in my new 180 gal..
BB is great however, the detritus DOES build up under the rockwork but if u get some waterflow under it, it all blows away and gets collected up. that being said.. u only do that to the stuff u cannot suck up with a hose when doing water changes directly from the tank.
IMO with sandbeds it is worthwhile i fu have a decent cleanup crew and good sand sifting critters. If you were concerned about it i doubt there'd be a great problem in stirring up the sand once i a while, portion at a time of course
