I just got an air pump (rated at 40 I have a 29g) and an air stone. It's supposed to be for a bubble wall. Unfortunately it doesn't seem like the air is getting out all along the stone. All of it is coming out of the end that the hose is connected to and next to nothing everywhere is. It's making the water too turbulent and doesn't look good anyways. How do you fix this? I figure the pump is strong enough to get the air through all of the stone but maybe not?