The Hang-on Protein Skimmers are easy-to-install hobby level hang-on skimmer for marine aquariums. Hang-on protein skimmer model allows for convenient installation and are designed with simplicity in mind to satisfy the skimming needs of aquarists. Similar to the In-Sump Protein Skimmers as it also includes the silent-running Italian Sicce pump. It is made of quality acrylic-construction and is perfect for people with small tanks.