You could download the Aquarium Land app by navigating to the Google Play Store
Once on the store, click on the search bar at the top of the screen
Next, type in 'Aquarium Land' and select the first option
Click the "Download" button and wait for the app to start installing on your mobile device. Depending on your download speed, this should only take a few minutes
How to Uninstall Aquarium Land
If you no longer want this application on your mobile device and want to delete the Aquarium Land app, then you'll need to navigate to your Applications Manager
Once there, you'll be able to scroll through your apps until you reach the Aquarium Land app
Click on the application and hit the 'Uninstall' button
Wait for the app to uninstall from your device. It will take all the app's data with it