Abstract: A wall-mountable aquarium has a slim tank for containing water to keep living aquatic animals or plants. The tank includes a transparent front wall, a rear wall, opposite left and right side walls and a bottom wall, with the side and bottom walls being considerably narrower than the front and rear walls. A fixed enclosure is provided externally on at least one of the left and right side walls and bottom wall for containing part of accessory for the aquarium. A frame is attached on the front wall, which conceals the enclosure from direct sight from the front and includes a see-through portion therein to reveal only the living habitat inside the tank through the front wall.

Abstract: A background setting for an aquarium having front and rear walls and opposite left and right side walls. The setting comprises a water-resistant background sheet bearing a background scenery for direct submersion in the water of the aquarium to cover the rear wall, and a fixture for fixing the background sheet inside the aquarium.