Abstract: An apparatus for cleaning the inner wall surfaces of an aquarium tank includes a pair of magnetic assemblies adapted for mutual magnetic engagement. Both assemblies include an outer housing of waterproof material, and a planar surface adapted to impinge on the aquarium walls. A scrubber pad is laminated to at least one planar surface of the assemblies, and a strong permanent magnet is secured within the protective enclosure of each housing. One assembly impinges its scrubber surface on the inner surface of an aquarium wall, and the other assembly is disposed directly adjacent to the inner assembly and in magnetic engagement therewith. Translating movement of the outer assembly causes concomitant movement of the inner assembly, whereby the scrubber surface of the inner assembly is translated across the inner surface of the aquarium wall for cleaning purposes. A float is secured by a line or cord to the magnetic assembly disposed within the aquarium.

Abstract: A shield or guard for preventing damage to an animal watering bottle by an animal within a cage comprises a generally planar web of metal or similarly hard material having length and width dimensions similar to the water bottle assembly being protected. A pair of tabs are formed at the upper edge of the web, and are angled downwardly to engage a lateral wire of the animal cage wall. A tube opening is provided in the web adjacent to the lower end thereof to permit the water delivery tube to extend from the bottle through the shield and through the cage wall. The water bottle is disposed to impinge on the outer surface of the web, with the delivery tube extending through the tube opening, and a wire bail is secured about the bottle and hooked to a lateral wire of the cage wall to support the bottle on the cage.