It is best to change the water of betta fish every 3-7 days. They do not require very high water quality and do not pollute the water quality seriously. During artificial breeding, if the water body is small, it is recommended to change the water more frequently, about once every 3 days. If there is a circulating filtration system in the fish tank, the frequency of water change can be reduced, and water can be changed once every 7 days or so. If the water body is large, it can also be changed once every 5 days. How often to change the water depends on the size of the water body and the equipment. If the water quality in the fish tank is dirty, the frequency of water change should be higher. If the water quality in the fish tank is not dirty, the frequency of water change can be lower.

Betta fish can be raised with tap water, because they do not require high water, tap water is not only easy to obtain, but also the water quality is relatively clean, so most breeders will choose to raise betta fish with tap water. Although betta fish do not require high water quality, they like to live in neutral water best, and it is best for breeders to keep the PH value between 6.5 and 7.2 when changing water.

Although tap water can cultivate betta fish, the tap water just received contains more chlorine, which has a certain impact on the normal life of betta fish. Before changing water for betta fish, breeders need to expose tap water to the sun for 2 days, which can effectively remove chlorine from water.