uxcell 2 in 1 15.4" Long Blue Bubble Wall Airstone Tube for Fish Tank Perfect for your fish tank or aquarium, and it is the best partner for air pump. Instantly create a great deal of tiny bubbles that your fish will love. The tube can be cut with a razor blade to be shorten. Additional bubble walls can be jointed with the enclosed connector Need to use a pin or needle to puncture for as many small holes as needed before using.