Not to play devils advocate here (especially at home/manhattanreefs) but I don't think that it is totally nessesary to be completely barebottom.
Please wait and don't jump on me repeating the "Bomber mantra", BB - good, DSB - bad. I read all the scientific literature that Bomber did concerning DSB crashes and oligotrophic environments. It boils down to this - after considerable time (years) the anaerobic/microaerophilic population of bacteria present at the bottom of the DSB push into the aerobic region of the DSB and begin to compete with the aerobes. Once this happens phosphate is released by anaerobic bacterial death as oxygen hits them and from the wake of two competing bacterial populations (anaerobes vs. aerobes) literally going at it for nutrients.
If you had a shallow sandbed, i.e. not deep enough to harbor anaerobic bacteria, then the potential for phosphate release and a future sandbed crash becomes minimal. But one might say "When I removed my DSB it stank and was FULL OF CRUD!!". Well what you smell and looks like crud is the anaerobic bacterial population, not fish $hit and such!
I would bring this up on reefcentral, however, describing the potential thread as UGLY would be an understatement.
[ March 22, 2005, 01:44 AM: Message edited by: solbby ]