The Marine Aquarium Deluxe 3.0 software has the capability of displaying a maximum of 30 fish at once on the screen. However, not all systems have the resources necessary that will allow them to show all 30 fish without causing freezing. If you experience problems with the screensaver freezing up your computer, you may have insufficient resources necessary to display 30 fish at the same time. To correct this issue, you can either free up more system resources or you can lower the number of fish being displayed. You can often free up system resources by closing down other applications that may be running in the background.