I just installed a powerhead in my aquarium and notice I can control the amount of airflow that enters the system. If I open the valve all the way it is super bubbly and if I close it there are no bubbles at all. Of course, I can also adjust the airflow to anywhere between those options. How much airflow am I supposed to give the powerhead? My 30 gal aquarium is home to 2 clownfish and a small zoa colony. Thanks!


