Where you have it actually looks pretty good. Bubbles from it being directed at the overflow or drawing from the surface? If the latter, you have that pump blasting. I would actually have it even closer to the surface (like right to the bottom of the sticky holder) to create a "roll" in the tank, but the speed has to be adjusted to prevent sucking from the surface. I'd probably have it mounted 180 on the opposite side. Of course this all depends on what you are keeping and your flow needs.