I am torn between absolute cleanliness and the irresistible fantasy of FW ecosystems made of small invertebrates. Just watching pond muck spring to life should tell anyone that we haven't even begun truly enjoying the world of FW creatures. Filtration today is too crude for long-term sustainability of micro-ecosystems. We'll need something like ionic plates that pull only specific pollutants out of the water while allowing the rest to coast by intact before we can really get into the "Live Rock" of freshwater more fully.