what kind of tank is it? 24 gallons. Is it an all in one? if it is what's in the chambers? If it's not what kind of flow do you have, pumps etc....? please give us more info. Sand bed? how deep? how much LR?
you don't need airflow. for comparison all I run for filtration is my skimmer some floss, activated carbon, and my macro.
post some pics of your set up so we can see what you've got going and we can all chime in on what we think is best for you.
:welcome to nanotank.