Tap water needs to be dried for several days, and the water temperature in the fish tank is the same. It is best to use old water to raise fish, because there are more green algae in old water, which is also a very good auxiliary feed for goldfish. If it is found that the color of old green water turns to clear water and there are a lot of green algae under the tank, it is necessary to replace this water in time. This kind of water makes fish sick easily. The water changed for fish must be stored for several days, and attention should be paid to how many fish to raise.
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Try to stop eating one or two meals after changing water, unless it is a very small amount of water change, such as about one tenth, otherwise any water change will cause water quality shock, which is not slight for fish, and some sensitive fish may not adapt. Another possibility is that some fish will have a big appetite because of the stimulation of new water. If you feed it right away, although you are very happy, you will have gastrointestinal discomfort.
Check the water temperature and quality immediately after changing the water for ten minutes, and then turn on the oxygen supply and filtration equipment. After about ten minutes, look at the water temperature meter again. The temperature in the fish tank will be more accurate at this time. If the temperature difference is too large, corresponding heating measures should be taken to deal with it.
Including the reopening of filtration, some sundries may enter the fish tank in the pipeline and pumping pipe of the filtration system. Therefore, after changing the water, if this happens, you can fish it up with a fishing net or properly drain the bottom of the fish tank, which can ensure the cleanliness of the fish tank.