If goldfish live in a spacious space, the breeding density of this kind of fish in the container is not high, and the oxygen content in the water is enough, that is, this kind of fish can live here well without oxygen. But if you live in a closed space, this fish will not survive for 48 hours. Therefore, choose a large enough fish tank, it is best to cultivate some algae and aquatic plants in the tank, change the water regularly, keep the fluidity of the water in the tank, etc., all of which are to increase the oxygen content in the water as much as possible without oxygen, so as to avoid excessive hypoxia in the water.

Oxygenator can be used to oxygenate goldfish. Change water regularly, clean up food residues and excrement in the fish tank in time, keep the tank clean and tidy, and also help to increase oxygen. Attention should be paid when changing water, the frequency of changing water should be high, the amount of water should be less, and half of the amount of water should be changed at most each time. You can also buy air pumps and gas stones, connect them together and put them into the water for electricity, pay attention to the air pumps not put under the water, or buy an air supply pump, aerator and so on.

You can also raise some aquatic plants or phytoplankton in the tank, and release oxygen through their photosynthesis ability to increase the oxygen content of water. You can also put some chemicals into the water, such as calcium peroxide, hydrogen peroxide and so on.