I just got one of these things in the mail and i cant get anything to come through it. I even tried hooking it to an air pump...... I am using diy co2 sugar and yeast in a 2 liter. I had it hooked to an air stone but bubbles were too big. but I cant get the glass diffuser to work so i rehooked my air stone and its bubbling again. huge bubbles going right to the surface..... any help would be greatly appreciated..