The ornamental fish surfaced and opened their mouths, indicating lack of oxygen. Fish live in water, and get oxygen through the contact between gills and water flow. If the oxygen content in water is too low, it will lead to lack of oxygen for fish, which may not only float their heads, but also lead to their death. Usually, the best way to increase the oxygen content in water is to prepare an oxygen pump and pump oxygen into water 24 hours a day, so as to avoid hypoxia. In addition, daily water change can also increase oxygen.

1. Inject new water: For hypoxia, new water can be injected first. Because the dissolved oxygen of new water is higher, and some oxygen can be brought into the water body during injection. It should be noted that the newly connected tap water cannot be injected directly, because it contains chlorine and needs to be dried for several days before it can be used.

2, turn on oxygen pump: Oxygen pump is one of the most commonly used oxygenation methods, which can prevent the occurrence of hypoxia and is very helpful to the health of fish. It is usually turned on 24 hours a day, which can completely prevent hypoxia. If you don't want to drive all the time, you'd better drive for a while in the morning and afternoon.

3. Drug oxygenation: The way of drug oxygenation is to use oxygenation tablets, which will continuously produce oxygen after being put into water. It is a very good emergency item and may not be used at ordinary times. It should be noted that family fish farming is rarely used, because the amount of water is too small, which will change the pH value of water body after use.