A sump may be found below many different types of saltwater fish tanks. A sump is essentially an additional tank that may be used to hold equipment for your marine fish tank. Some of the advantages of doing so include concealing the components of your aquarium from view.
This video will take you on a tour of the sump for a marine fish tank that is 125 gallons in capacity. A sump for a salt water aquarium may be installed in a variety of different ways. The movie does an excellent job of providing an overview, which helps you get a sense of what a sump is and how it operates, which is one of the things that I appreciate most about it.