Overflow aquariums are aquariums with built in overflows. They are most commonly used for saltwater tanks but perfectly suitable for freshwater as well. Overflows can be internal (inside the tank) or external (attached to the outside of the tank, usually on the back wall. Overflow aquariums will require additional external filtration, located inside the stand below the aquarium. 

Aquariums are made to order and generally ship 2 to 3 weeks from order date.