I have found a way to use the aquarium as the desktop background.
if you want to see a larger picture use:
http://www.geocities.com/rickw512/fishlarge.txt
what I did was start the screensaver in window mode and resize the windows so it was the enire size of the screen, except for the taskbar. This created the problem of covering the desktop icons, so i created the desktop toolbar (on the left side) that will give me full access to the desktop, and will auto hide when not in use.
Since the screensaver runs in idle priority none of my other apps are effected, i can run any program with the screensaver running and not notice any slowdown, and if i should have a problem with an app, all i would have to do is minimize the saver, which effectivly shuts it down
[edit]I guess i should have read the post above this, it looks like i'm not the only one with this idea, but my post has pics

[/edit]