It is normal for a wild betta fish to cost 100 yuan. When raising betta fish, you should choose strong fish species. If you are raising betta fish alone, a fish tank of about 30 cm will be sufficient. You can plant a few more aquatic plants to purify the water quality. If the water used is tap water, it needs to be exposed to the sun for two days before use, and the water must be changed regularly. When feeding, you can choose artificial feed, as well as animal feed, preferably live feed, such as red worms, water earthworms, water fleas, etc., so that the betta fish will be in better condition.
Betta fish do not have high requirements for the fish tank, nor for oxygen. A fat water cup is enough. It will stay inside quietly, stretching its tail. Bettas are aggressive, so keep one betta in one room. Be careful, betta fish have a habit of jumping out of the tank, especially when changing water or when frightened. If a betta fish feels any discomfort, it will choose to jump out of the tank. Remember to cover it.