An aquarium cleaning system has an inner member adapted to be positioned adjacent an interior surface of a sidewall of the aquarium; an outer member adapted to be positioned adjacent an exterior surface of the sidewall such that the sidewall is interposed between the inner and outer members; an attachment mechanism that retains the inner member and the outer member in a fixed position relative to one another; a cleaning member mounted on the inner member and adapted to clean the interior surface of the sidewall; and a control system adapted to cause the inner and outer member to collectively move around the side wall of the aquarium such that the cleaning member cleans the interior surface of the side wall during such movement.