Patent ID: 7744355

Claim:
An aquarium pump, comprising: an outer member adapted so that a first side thereof may be disposed adjacent to an exterior surface of a sidewall of an aquarium or tank and including a first magnet and a first encasing supporting said first magnet; a submersible inner member adapted so that a first side thereof may be disposed adjacent to an interior surface of the sidewall of the aquarium or tank and opposing said outer member such that the sidewall is interposed between said inner and outer members and including a second magnet and a second encasing supporting said second magnet; a motor-and-impeller assembly; and an attachment mechanism that uses magnetic attraction to retain said inner member and said outer member in a fixed position relative to one another, wherein said second encasing of said submersible inner member receives a plurality of ball bearings that are exposed to and disposed upon the interior surface of the sidewall of the aquarium or tank and are rotatably secured in place by said second magnet of said submersible inner member.