So I'm finally ready to move from the HOB 'fuge to one in my sump with about three times the volume. Moving the chaeto is easy; however, there's a thick layer of sediment (sand, mud, detritus, etc) in the bottom of the HOB 'fuge. I'd like to keep whatever pods and other beneficial critters are in there, but would rather get rid of all the junk that will just keep trying to raise my nitrates/phosphates. Any suggestions?