Oh you certainly can do nice low tech tanks, though mine has been struggling for some reason (my water sprite just doesn't want to live anymore..). I've considered a riparium as well, and all these tanks do look fantastic. My only fear with a riparium is having an open tank to me is scary, my frogs have already shown great skill at escaping so I would need a glass lid.. Do you have any more pictures of your 40B tank? I really like it, how did you do the backgrounds.