[Kent]

Here is a suggestion for having different varieties of fish appearing on the screen while maintaining the same number of fish all the time.

When a fish swims off screen, that fish would not reappear, but a different type of fish can enter from the opposite side of the screen. When a fish swims behind the coral bed, that fish would not reappear, but another type fish would swim out from behind the coral bed. All 26 different fish in the same screen saver would be used by turns, and the maximum number of fish you would like to be visible at any time in the screen saver (maximum being 7) would remain consistent.