When changing the water in the fish tank, you need to pump out part of the water first. If there is a water pump, you can directly use it to pump water, which is more convenient. If you don't have it, you can siphon the water. Prepare a pipe, put one end to the bottom of the water, then suck on the other end, immediately put it into the container of water, the water in the fish tank will be pumped out, if the amount of water is similar, you can take the pipe out.
1. Water quality: The first thing to pay attention to when changing water is the water quality. Once the water quality fluctuates, it will do great harm to the fish, and even lead to their death. The source of water usually used must be consistent, and it is not easy to change the water source. Usually home fish are tap water, but can not be used with the next day, the need to meet a day ahead of time after the sun into the sun, the sun on a day can be.
2. Water temperature: Be sure to pay attention to the change of water temperature when changing the water. The temperature difference between the new water and the old water should not exceed 1-2 ℃. And don't pour new water directly from the top, which will also cause changes in water temperature. Generally, new water should be poured slowly from the tank wall, so that it is safe to change water.
3. Water volume: When changing water, pay attention to the water volume. Changing too much water will stimulate the fish body and cause uncomfortable reaction. Changing too little water will not improve the water quality. Usually, about a quarter of the water should be changed every time, not more than a third at most.
