It blows air out so why does air go in? I am very confused.
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I think you are confused.
Aquaria use two different ‘pump’ things. The first is a water pump that sucks in water, usually through a big straw-looking thing with a screen at the bottom (to prevent fish from getting sucked in). The water goes up into a chamber where it’s run through a filter and then poured back into the aquarium with a waterfall type spout. That *might* be it depending on the aquarium and the fish inside.
But fish need oxygen. So what you might be talking about it are those little pumps that connect to a tiny tube with a stone at the end that make tons of tiny bubbles. Those aren’t filters, they are air pumps that exist to get as much oxygen from the air to dissolve into the water as possible, so the fish can breathe.
So, two different things.
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