For 10 gallon Aqueon tanks purchase includes one black divider for an aqueon tank Aqueon Tank size : 20.3"L x 10.5"W x 12.6"H The 10 gallon tank divider is perfect for Betta fish tanks or to separate fish. They're easy to install and maintain. The divider will not work in a tank with no rim. Suitable with tanks with substrate Mitigates aggression and aggressive behavior Cast Acrylic The listing is only the tank divider NOT the tank . Made in the USA. Veteran owned Need for another brand or for another aquarium, contact us for custom order.