This museum goes to great lengths to make everything appear natural. They didn't need to build this 2-story waterfall/rock wall, the animals are all fish and song birds, but it really adds to the natural feel and beauty of the place. All of their indoor exhibits are like this, with shallower tanks having a fully decorated and natural looking above water area.
@Fignewton I didn't see any, so I didn't take any sign photos... I'm not sure there were signs, actually. Sorry! They're pretty good about replying to e-mails if you contact them.