As I have been reading posts, it seems frogbit might be a good floating plant that might be more controlable (ha!) than duckweed. I am having a problem finding it at the lfs which leads me to believe it might be banned here in Florida although I can not find it on the banned list. Anyway, looking at the aquarium plant sites, I have only found one so far with it available and that is of the large pond variety. Any suggestions or information?