If the fish in the fish tank is dead soon, you can fish it out and change the water as usual, because the water quality will not deteriorate.If the fish has been dead for some time, the best way is to fish out the live fish first, then empty the tank, and change the water completely.It should be noted that the new water must be used trapped tap water, can not use the water just received fish, otherwise it will raise problems.
1. Water change cycle: There is usually no fixed cycle for changing the water in the fish tank. It mainly depends on the maintenance of the water quality. Generally, the water can be changed once a week. If there is a filter device, it is no problem to change it once in half a month.Water can not be too frequent, frequent water change is easy to stimulate the fish, and then will produce stress response.
2. How much to change: The amount of water to change depends mainly on the frequency of water change. If you change it frequently, you should change less water. If you don't change it frequently, you should change more water.If you change it once a week, you can change one fifth to one quarter each time.If you change it once every half month, you'd better change one third of the total amount.
3. Precautions: When changing the water, you must not change the water by violence. This will cause fluctuations in water quality and water temperature, which is harmful to the health of the fish.You can first slowly pump out the water from the bottom of the tank, and then slowly pour in the new water from the wall of the tank, so that the water change will not stimulate the fish.
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