Its not so much the mud, but the filter as a whole. The ecosystem filter claims to be a skimmer free system, but I just don't know weather or not to bank on that. I guess the whole problem I see, is that they are trying to create a nitrate lowering filter, yet they still have a bio ball chamber in them. I would think the filter would be better served by replacing the bio ball chamber with a powerful skimmer, and leave the culerpa to handle nitrates created by the LR and substrate, then again, the question becomes weather or not there would be enough nitrate to keep the culerpa going.....hhmm....conundrum.
"J"