>Right, those nutty plant people would probably flame us for thinking >of wasting that valuable light energy and fertilizer on emergent floating >plants. :) One of my favorite plants is water lettuce, Pistia stratiotes. A floater. I remove half a cup of salvinia and duck weed every week from all my tanks. The water lettuce has a large root system and grows at a nice pace. It starts little plantlets and can get rather large if you let it. You should try it for filtering, not near as messy as duck weed. Tim