Entertaining but needs more choices

I toggle between this app and my wallpaper. I use it as a screen saver. I had a similar app that is no longer compatible with Maverick. It had lots of fish to choose from and choices for the environment. Still, I enjoy watching the fish go by, even though I can predict where they’re going and what will happen next.

HHarbour about Desktop Aquarium - Relaxing live wallpaper background