Abstract: An ornamental device for use in fluid-filled viewing tanks for enhancing the aesthetic nature of the tank. The ornamental device having a decorative body member and an affixed retaining member for semi-permanently securing the ornamental device to an inner surface of the viewing tank.

Abstract: A habitat system for use in small animal enclosures providing desirable living space for underwater, amphibious and land dwelling animals. The habitat is formed from a wall type structure with one side which is essentially concave, thereby forming a gap space behind the wall. The habitat system is removeably attachable to the inner wall surface of the animal enclosure. Surface decoration may be provided on at least one wall of the habitat system, and various component parts may be intermeshed in a variety of ways in order to form multiple configurations.