I have been curious about this set up but was not sure how to explain it. So nothing better than a pic to back me up.
Since i am not a big fan of bubbles/air stones i was told by the LFS to get a power head. As you can see in the tank it is next to the intake, pointed diagnol so it bounces of the side glass then the front. I am not sure how this power head helps in replace of the air stone, but i guess it helps circulate the water in the corner.... or is it useless in your opinion?? The fish do seem to play in the current from time to time..