Hydor USA SlimSkim Internal Skimmer for Mini Aquariums and Mini Reefs Designed for tanks up to 35 gal Energy efficient, only uses 4 watts of energy Includes Patented Magnet-Suction Cup mounting system Adjustable air control and foaming level 3 1/8 x 3 1/8" x 12* *Height size = skimmer body only (without collection cup)