Wow...very cool! I know I'm going to be planting the snot out of it, anyway. I really enjoyed the effect of this waterfall that a coworker sent me a pic of, and, being the adventurous engineering student I am, is a great challenge. From what I understand, the biggest challenge will be to make sure that water circulates to every part of my tank and I don't end up with 'dead zones'
http://bp0.blogger.com/_cwbt2D65i9k/...0-h/2007_7.jpg
Mostly, I enjoyed the calm, pastoral setting, the kind of hobbiton-esque feeling that a setup like that evokes. Also, since my girlfriend is a mite obsessed with Faeries (and fish, she is just as excited about me setting up a new tank as I am :D ) I do believe I'm going to make an underwater faerie garden. There's a smattering of how-to's online in reference to sealing various things with aquatic epoxies and even more small and cheap faerie houses and ornaments that I could easily see working in a setup like that.
I was really thinking hard about getting schooling fish versus a couple a bit larger than the Ember Tetras and
Dwarf Puffer I've got currently, but I do believe the CPD's tipped the scales ridiculously in favor of schooling fishies, not to mention how well they'd work in a setup like that.