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The aerator in a fish tank pushes air into the water. Some of the oxygen from the air stays in the water so that the fish in the aquarium can breath it.

Even though fish live in the water, they still need oxygen to live. When they pass the water through their gills, the oxygen in the water is taken into the fish's blood stream.

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9y ago
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12y ago

yes to filter oxygen and dirty water

An aerator adds oxygen to the water for your fish and does nothing for dirty water other than to move it around!

I have a 75-gallon freshwater tank and have an aerator. I may not need it because my filters add oxygen to the tank also. But I do not want to take chances with my fish so I have a stone aerator in the tank also to ensure they have oxygen.

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14y ago

Most goldfish do need an extra source of aeration in their aquarium. However, few people actually choose to provide one. An aerator will only benefit your fish and aren't very expensive compared to other aquarium equipment.

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14y ago

No, you don't need it. A filter is enough but it wouldn't hurt to have one.

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Q: What does aerators do in a fish tank?
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