You can now change the color of the frames around your game.
Click the rectangular button with three different colored squares located in the lower left hand corner of your tank.
You will see a pop up with different color and theme options.
Some are available for coins and some are for Fish Bucks.
Click the “Buy” button under the color or theme of your choice.
Once you have purchased any of the available choices, the “Buy” button will become a “Select” button and you can freely change from one theme to another without having to purchase them again.