I voted no because, as this screensaver has sparked me to start up a real saltwater aquarium, the freshwater may do the same for others. They may see these "cool" and different fish in the screensaver and decide to get themselves a tank, therefore encouraging the practice of mutilating fish for fashion and supporting those who profit from it.
Here was another "cruel to fish" thing that I was against:
http://www.aquababies.com/
Do. Not. Buy. These.
Here are some stories:
http://www.bettasrus.com/Products/AquaEmail.htm
http://userpages.umbc.edu/~rrhudy1/aquababy.htm
http://www.tpka4a.com/911.html
http://www.rk2000.com/boycott/aquababies.html
The aquababies story is in the middle of this page somewhere:
http://www.wetwebmedia.com/FWSubWebIndex/fwfishfaqs.htm