How often to change the water of fairy fish The cycle of water change of fairy fish has to be based on the age stage of the fairy fish. For example, if you are a small fairy, you need to change the water every day, or even twice a day, but the amount of water you change each time can only be 20% of the ratio, and clear water is good for growth. When the fairy fish grows to the subadult period, it still needs to change the water once a day, but the amount of water changed each time is between 15% and 20%. However, at this time, it is necessary to fish out the residual food in the tank after each feeding to avoid the accumulation of food affecting the water quality. The body and resistance of adult fairy fish is enough to resist the change of water quality, so you can change the water once every 2 to 3 days. If the water quality does not deteriorate and oxygen is sufficient, you can extend the water change time appropriately, just once a week.
