Introducing Fish Bubbles($25)! These hip and trendy fish tanks can be hung virtually anywhere! They require no pump or filtration! You can decorate your Fish Bubble with any aquarium accessories and keep goldfish, bettas or any other "easy-to-maintain" fish in a cool happy home on a wall! You can also create a wall hanging terrarium!This model is the 3.6L size. 11.5" diameter.