There are multiple tanks available for individual configuration and viewing. Some tanks have more plants than others, some no plants at all.
If you press the H key when the aquarium is running it will show you available shortcut keys that will prove helpful.
Pressing the space bar will present the options panel as well.
The [ key and the ] key allow you to scroll through the tanks while the aquarium is active and any settings you change to the individual tanks are saved for that tank when you click the OK button.
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