Aqua-Soft Forumsdoes any body have any freeware fish savers or no where to find any. 
Screensavers-aquatic
I've gotten some before, but they really suck. They're nothing like the one in Microsoft XP Plus. But the Plus one get get really boring because they only give you a few different fish to choose from to put in the tank. If you want all the fish you have to buy the full version from Microsoft.
You have to pay for it, but there is a Demo you can download. It has a very nice selection of Fish. I run it and it's great.