Thai betta fish can change water once every 7-15 days. They are small in size and do not pollute the water quality seriously. Under normal feeding conditions, it is generally enough to change water once a week. How long they change water depends on the density and equipment of feeding. If the feeding density is on the high side, the frequency of changing water will be higher, preferably twice a week. If the filtering system is installed, you can choose to change it once a week.

For normal feeding density, even if there is no filter, you can choose to change water once a week. If there is a filter, you can choose to change the water once every 2 weeks.

Thai betta fish have low requirements for water quality, and they can live in weak acid, weak base and neutral water. When raising them artificially, you can choose to raise them with tap water. Because tap water is clean and easy to obtain, it is very suitable for raising Thai betta fish.

Tap water is chemically treated. Although some chemicals contained in it can't do harm to human body, they have certain influence on the health of fish. Breeders need to expose tap water to the sun for 1-2 days, so as to completely volatilize the chemicals in the water.

Breeders can also choose to use well water to breed Thai betta fish, but the temperature of well water is relatively low, so breeders need to adjust them to the same temperature as old water before using them.