This easy to use vacuum makes cleaning your aquarium tank convenient. Vacuums have a self-start siphon that allow you to easily activate the vaccum. Makes it easy to keep your aquarium cleaner without having to drain all of the water. Designed to separate and remove debris from the aquarium during routine water changes. Ideal for use in tanks with up to a 20 gallon capacity. 9 Small Gravel Cleaner, Cylinder Dia.1 5/8 Length 9 Hose Length 7/16 X 56: Size: 9 in.