Sorry still no new entry--these things take a while to write--but in the meantime here is a quick video for that 50-gallon featuring Acorus gramineus and other plants (and lots of fish and other stuff).
Do you think that you will finish this little educational post? I am interested in setting up a riparium and found this thread while searching for a list of good riparium plants. I found what you typed up so far very informative. Not many people posted here, but this thread does have over 1000 views, so people are reading it.