tropical fish tank. This kind of water contains residual chlorine. In order to avoid the fish being affected, it is necessary to trap the water in advance so that the chlorine can volatilize. There are many ways to trap water, usually using the drying method, that is, after the water is connected, put it in a sunny place for about one to three days.

2.

First of all, the old water in the fish tank should be pumped out, and then the new water can be injected. The old water can be pumped by a pump, or by a pipe, which can be siphoned out. It is better to pump water from the bottom of the tank, which can also bring out dirt, thus contributing to the maintenance of water quality. Water should be injected slowly from the wall of the cylinder, so as not to cause fluctuations in water quality.

3. Changing water cycle

is conducive to improving water quality, but changing water too frequently can also stimulate fish, so we must pay attention to the cycle of changing water. Usually, it can be changed once every five to seven days, and each change of water is usually one fifth or one quarter of the total amount of water. If there is filtration equipment in the fish tank, it can also be changed once a half month.

4. Precautions

Fish, as poikilothermic animals, are very sensitive to temperature changes, so when changing water, they should also control the water temperature to avoid too much fluctuation. You can measure the temperature of the old water before changing, and then mix the new water according to this temperature to ensure that the difference between the two is not more than 2 degrees Celsius.