Alternatively, you may simply click the "Disable Fish" box.
Setting Individual Fish to "Off" - Clicking the down Arrow past the "?" will turn the fish off, effectively removing it from the tank until you choose to change this setting. This fish will now randomly appear in the tank every time you start the program (assuming you have any random slots assigned, more on this below) Setting Individual Fish to "Random" - Clicking the down arrow to none will bring up a "?" which sets the fish to "Random". Clicking on the arrows to the left of this number will correspondingly increase or decrease the overall population of the tank. The upper number indicates how many fish in your tank are set to randomly appear, the lower number governs the total number of fish in the tank.
Bubble Column - Enables the Bubble Column in the Tank.Display Window Title Bar - Turns off the Title Bar in windowed mode for a cleaner look.Always on Top in Windowed Mode - When Marine Aquarium is in Windowed Mode (See "F" hotkey) this option will place the program window over any other program you are running.Start in Windowed Mode - Launches Marine Aquarium in windowed mode, will launch the program as an individual Window on your Desktop, rather than filling the entire screen.
De-checking this option will stop the Aquarium from panning entirely.
To bring up the settings menu, press the spacebar on your keyboard while Marine Aquarium is running then click on the Program Settings button.