For 60 to 800 gallon tanks.In Sump Protein Skimmers.The Simplicity DC Aquarium Protein Skimmers use a controllable DC pump with a needle wheel; regarded as one of the best methods to shred air and water to create micro fine bubbles. These skimmers provide one of the keys to a successful protein skimming—a long contact time between water and air. The bubble plate, wedge pipe indicator, air intake adjustment and controllable pump allow you to achieve the best performance for your unique system.Related Products:Simplicity Protein Skimmer Replacement Parts.Useful Links:Why Do You Need A Protein Skimmer?IWhich Protein Skimmer Should You Buy?IProtein Skimmer Troubleshooting.