An aquarium cleaner system for cleaning the bottom surface of an aquarium. The system has a suction means with a naturally buoyant suction body. The suction body has an open enlarged lower end, an open upper end and a propeller system. The lower end is adapted to be seated on the bottom surface of the aquarium and the open enlarged lower end is fluidly connected to the open upper end. The suction means creates an untreated water flow from the open enlarged lower end to the open upper end. There is also a filter with an opening fluidly connected to the open upper end of the suction body, an impurities entrapment surface and a fluid return surface. The untreated water flow is received at the opening and forced through the impurities entrapment surface, leaving behind impurities on the impurities entrapment surface and creating a return flow in a cavity defined by the fluid return surface and the interior surface of a filter housing. There is further provided a controller for turning on or off the suction means according to a preprogrammed schedule and a random position effecter, such that when a new cleaning position is desired, the suction means is terminated for a first predetermined duration so that the naturally buoyant suction body causes the aquarium bottom cleaner to rise from the current cleaning position before turning on the suction means for a second predetermined duration so that the random position effecter causes the cleaner system to move laterally in combination with lowering the same onto a new cleaning position on the bottom surface of the aquarium.
