[AJ_77]

I would have agreed with you until recently - I cleaned the sandbed out of the tank I just got (1-2 inches' worth of aragonite). It was aboot 18 months old, and the filth that came out of that nearly made me puke. The tank was well-maintained and filtered, B-King skimmer etc... what I would consider "clean," but that nasty skunky leftover toxic mud made me think twice. Just too gross to contemplate.

I think it was a wise moderator here who once said, "how can all that trapped black goo be good for my system?"

Thinking of going BB next time (and I usually love all those little critters that inhabit the sand, add to biodiversity and filtration capacity, etc etc...)