I've had duckweed in my tank before, and I hated it so much! Took me a month to get rid of those stupid floating leaves... Anyways, I'm thinking about trying floaters again, such as frogbit or dwarf water lettuce, to give some extra cover for my CPDs and help diffuse the light. I do not like big roots hanging down, though, so I'm not sure what plant would be the best choice. And I'm not sure if it is even worth it... anyone want to share their experience, positive or negative, with floaters? Is it a good idea?