A protein skimmer is one of the most important components of an aquarium. It removes all your organic pollutants and nutrients before they break down. It helps keep your water crystal clear and your aquarium inhabitants healthy. We recommend you purchase a skimmer rated twice your system volume, or the highest skimmer you can put into your budget. Our Top Selling Skimmers and best bang for buck are the Reef Octopus Protein Skimmers.Looking for a protein skimmer for nano aquariums. Take a look at the best selling Tunze 9002 Protein Skimmer.