Realism is what that team tried to obtain and they did. You will be convinced by the quality of this screensaver

Tickle the fish, feed the fish, set the lighting to change automatically. You get three extremely realistic scenes and 10 tropical fish which swim under the surface water which ripples as the light that shines through.

3D Sea Aquarium Screensaver is one of the most realistic aquarium screensavers ever developed.