If you use a powerhead for aeration, do you use the little hose to allow air flow? I'm thinking of just plugging the hole since it's pretty loud and it's in the bedroom. I'm pretty sure that it's already supplying more than enough areration with just the water movement. What do you think?

Most of the time I've got the air flowing through it. But, on
the odd day, I close off the air supply making it just water
movement. If your not to fond of the noise being produced,
plug it. I've got penguin powerheads and the air hose has a
valve that can control the amount of air flowing through.
Basically it's personal preference. B)

Yah, I've gotten in the habit of turning the air off at night and back on again in the morning. I was trying to decide if I should keep doing that, or just plug it up. When it's running, it makes some really tiny bubbles that make the water look cloudy.

Actually...I would plug it because it creates a strong current that your goldfish might not like. In my LFS, they have a 75 tank with a powerhead and they use the power head for aeration. Their fish looks a bit dizzy coz of all those bubbles. If you're ok with it...then I guess there might be a valve on the hose to close it if you don't want the bubbles as pm94 said...Good luck

When I was running a powerhead on one of my tanks, at first I'd plug it at night because of the noise, but then I got used to it and just left it on 24/7. If its too bubbly you can turn down the water flow if you have a flow control. As long as you've got something else oxygenating your tank you should be fine with it plugged.

Well I have a large filter that really agitates the surface and the powerhead even without the airflow moves a large column of water. There should be enough water flow even without the bubbles so that the dissolved oxygen won't drop a lot if I turn off the air flow to the powerhead at night. I never unplug the powerhead.