I just got this skimmer new. i can't get the thing to produce bubbles at all. i tried moving the thing up and down and adjust the screw back and forth with no result. i notice water coming thru the airline. on my sapphire aquatics skimmer when this happen it wouldn't work also. all i had to do to that one is rise it out of the wter while running and it would stop. i tried that with the tunze but water keeps running thru it. i even tried removing the tube and blowing thru it to make sure all the water was out of it. . did i get a bad one btw its not making any noise at all. also where can i buy the magnet mount for it. i tried searching premium aquatics and marine depot but didn't find it thanks