This is an all-in-one external hang-on canister filter for any freshwater or marine aquarium. This item includes all the parts, media, and accessories you need right out of the box. No extra parts needed. It is a three stage filtration system that removes debris and wastes for crystal clear water. Adjustable flow rate. Easy to use. Ultra-quiet, Hang on design makes it compact and easy to use Silent operation compared to other similar filter