This is an all-in-one external 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. The included UV 9W sterilizer removes algae and harmful organisms. The powerful and strategically placed pump allows for super silent operation unlike conventional top mounted pump. Flow rate is 700GPH and will work with up to 125 gallon aquariums.