Fish Tank Powerhead Aquarium Protein Skimmer Filter Pump 530GPH Double venturi pump produces almost 50,000 micro bubbles a minute - making sure everything that can be skimmed will not be missed 2 applications: can either suck on the in wall of aquarium or hang on the tank (hanger width: 5/8") Completely self-contained: no additional equipment needed Rather quiet operation will have no noise to the fishes, corals or other aquatics Totally submersible pump