lolz, i tink TS has received more compliments than answers to his posted question.
yes, there are many such setups around. i have frens (who are not in AF) that does that same as u i.e. setup tank in corridors and/or balconies. and the setup is doing well. as with ur observation, i do think that the algae form an important aspect of any outdoor setup.
btw, ur setup swee bei swee lah!