Eshopps has a series of overflow boxes designed to fit any aquarium size. An overflow box transport water to a sump, Refugium, and wet/dry filters that are likely concealed in a cabinet. Overflow boxes can be placed in the aquarium or outside. Most often, they are outside between the tank and the wall. This helps with maximizing the space in the aquarium. All boxes are fitted with accessories to attach to the aquarium. They are easily installed and can be move if necessary. Eshopps carry a series of PF overflow boxes. The lower the series number, the smaller quantity of water gets transported. The PF series include PF-Nano, PF-300, PT-800, PF-1000, PT-1200, and PF-1800. Another set of overflow box Eshopps has is Eclipse. Eclipse comes in small, medium, and large. They range from tank usage starting from 75-150 gallons respectively. Whichever choice you make, they are reliable, and with noise reduction, you would not realize you have one installed.