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You need to aerate it. If you have no filtration/aeration system, get a cup, scoop up water and drop it back into the aquarium from a height of about twenty centimetres. Do this for one minute every four or five hours until you can set up a filtration or aeration system. Overstocked tanks (too many fish) will use up oxygen faster than it can be replaced, even by an aeration system. Adding live plants will also help to remove carbon dioxide and add oxygen to the water.

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Q: How do you fix low oxygen in an aquarium?
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Related questions

Why do gold fishes come up often till the water level in the tank?

If a goldfish frequently comes up to the service than this is an indicator that the dissolved oxygen levels are too low and the fish is therefore sufficating. To fix this do a large 50-75% water change and install an aerator in the aquarium.


Do plants in an aquarium provide carbon dioxide to animals?

No, plants in an aquarium provide oxygen to the animals.


How long can a fish live in a non-oxygen aquarium?

It depends on what kind of fish, and the size of the aquarium.


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Team Umizoomi - 2010 The Aquarium Fix It 1-2 is rated/received certificates of: Australia:G


How is an aquarium like the earth?

merchanical source of oxygen


What would have to do to control the oxygen level in aquarium water?

You can control the oxygen through aeration


What is a balanced aquarium set-up?

A Balanced Aquarium is one wherein the Oxygen/Nitrogen cycle is self sustaining.


Are aerator and plants importants in the aquarium?

Yes, aerator and plants are important in the aquarium to add oxygen in the water for the animals there in.


What are some needs of the animals in the aquarium that the plants can provide?

The some need of the animals in the aquarium that plants can provide is oxygen.


What takes place of water inside the funnel of the aquarium?

Oxygen


Why do they just sit for along time on the bottom of the aquarium opening and shutting their mouths all of them do it?

Depends on what kind of fish they are, but it sounds like they are not getting enough oxygen, and/or the water temp might be too low.


What is the function of the electricity bulb provided in the aquarium?

for the plants which make some of oxygen