I have the cutest little Chihuahua that my sons got us two years ago. Since I work from my home office on the computer all day, he is my perfect companion, always at my side and ready to take a ride to Home Depot, McDonald's or for a nice walk along the water where we live.
He is so well balanced and sweet. Check out my Hub about video taping your pets and you will not only see photos of Georgie, but two nice videos.
That said, I also have had tropical fish all my life and love watching the serene and calming tank as they swim and greet me when I go to feed them.
In my life it is all about minimum care and calm...I love my little doggie and my little fishies too. You can see some photos of my fish tank too on another hub I wrote about aquariums.