Check this out from craigslist

[Pangong_ilong]

A very cool fish tank. And it's cheap too.

http://newyork.craigslist.org/brk/for/156842710.html

 

[davo]

would be better if it was round not hex. always reminds me of those massive tall round tanks zoos have and they have some kind of shoaling sea fish in there that swim around and around in circles. that would be cool to do with freshwater fish

 

[GoodMike]

ya...i wouldnt want to scrape the algea off of that.... plus most fish dont swim up and down!