The water change cycle of the aquarium is not fixed. According to its size and the quality of the filtration in the tank, some need to be changed every few days, while others can be changed every half a month. Generally, the smaller the aquarium, the higher the frequency of water change. In addition, it depends on the turbidity of the water body, if the water quality is relatively clear, there is no need to change the water.
Most of the aquarium water is tap water, river water or well water may be polluted, and tap water after disinfection, in addition to containing residual chlorine, there will be no other problems. In order to solve the problem of a small amount of chlorine in tap water, it is usually necessary to dry it for several days after receiving water, so that the trapped water will not harm the fish.
The amount of water to be changed in the aquarium does not need to be too much. Generally, it is one fifth or one fourth of the total amount of water. Changing too little has no effect. Changing too much can easily stimulate the fish body and produce some stress reactions. However, for some fish with solid skin, the water can be changed slightly more, but usually not more than one third, which is the limit of water change.
If the fish in the aquarium are sick, the water change should be adjusted appropriately, because there are a lot of germs in the water at this time, and they need to be removed as soon as possible. At this time, water should be changed every other day, and the amount of water should be increased appropriately, so that the stimulation of the fish body will help to enhance resistance and help it through the disease period.
