The air diffuser can be cut to shorten, or joined together to give a unique custom design * Bubble wall fits across a 10 gallon tank * The bubble wall air diffuser makes a great addition to any aquarium and will add great movement to your tank * The Air diffuser can be cut to shorten, or joined together to give a unique custom design. * Bubble Wall fits across a 10 gallon tank. * The Bubble Wall Air Diffuser makes a great addition to any aquarium and will add great movement to your tank.