The Bookshelf Aquarium.

This space-saving aquarium won't encroach on work surfaces or living space because it is a mere 4" deep, yet it provides 180" sq. of viewing area and room for up to six fish. The 2.4-gallon aquarium has an air pump and filtration system that ensure precise environment control. The cabinet is made from shatterproof plastic and the integrated LEDs provide bright overhead light. The aquarium includes a submersible, three-dimensional seascape background and gravel. Plugs into AC. 13" H x 17" W x 4" D. (20 lbs. when filled with water)