I know you guys are a long ways from Texas but if you ever get down this way you should pay a vist to the State freshwater fish hachery in Athens Texas. They have a walking path that goes past mulitpule ponds and the walls are acrylic like face72 is discribing. It is real awesome to see the entire pond and all the fish in there natural habit. Here is a link too their site.
http://www.tpwd.state.tx.us/spdest/visitorcenters/tffc/visit/virtualtour/txaquaria/
