I believe air pumps or air stones are largely a matter of preference. I have them on my tanks because I run sponge filters. I also like them because in the event of a power failure the filters sometimes don't resume operation without priming the pumps. The air stones however resume operation the moment power is restored. You can also buy air pumps that activate automatically when power is lost thereby ensuring that the fish have oxygen being deliveredeven though power has been lost. They require small inexpensive batteries. Pretty cheap insurance if you ask me.
make sure you have check valves on the lines though. in the case of a blackout, there is a good chance you will drain your tank through that little line without really noticing
if you have a good HOB, you really dont NEED an air pump. unless its hooked to a sponge, its only used to aerate the water, which the HOB will do by itself.
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