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You want nothing more than the anaerobic bacteria and anoxic bacteria and SAND in the RDSB. Anything further and it can turn into a fug factory. Prefilter the water and keep the flow low enough as not to disturb the sand. Also seems to help if you use a bulkhead to drain that is at least 25% bigger than the input but that is personal taste.
Update: Installed the RDSB on my 220 system on 8/18/06 in a 15 or so gallon rubbermaid. Saw some minor bulging in the rubbermaid when loaded and reinforced with 1/4" x 3' zip ties on all 3 axis. As of last night had to take the system down as the rubbermaid was bulging around the zip ties grossly and I could not count on its structural integrity. I want something bigger than a salt bucket but it NEEDS to be strong and/or cylindrical. I don't have the stuff to drill glass so making a sacrificial RDSB out of a 20 high is out. I now don't trust anything that isn't BURLY or isn't cylindrical. May have to function test a draining a drilled/bulkheaded cylindrical trashcan next to the tank. Will update as events unfold.
As always, input is more than welcome....
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220 & 200 graveyard: Golden Puffer, Purple Tang, Dogface Puffer, Juv. Emp. Angel, Miniatus, Longhorn Cowfish, Juv French Angel. Spec-Only Angler tank.
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