The Mrs and I went to visit a Dr friend in Germany a few years ago and he had the most wonderful fish display I have ever seen and it almost covered a whole wall in his bedroom. I was completely mesmorised. He had salt water fish and a computer sysytem running it all as apparently it is more difficult than keeping the fresh water variety. When we retired later in the evening my wife just took one look at my expression and firmly said NO.
I had completely forgotten about that probably because it is more what you expect to see in an hotel like that rather than in a normal but very posh house. The fountain in the lobby is also fantantic and I do have some photos if I knew how to post them.