Arowana has strict requirements on water quality, and they like weak acidic soft water. When rearing artificially, the PH value should be kept between 6.5 and 7.5. If the water quality is alkaline or neutral, you can choose to expose it to the sun, or add a small amount of big soda to make the water sour. They like soft water. If the water used by breeders is hard, they can boil it first, and the water will become soft after cooling.

Besides adjusting the water quality, it is necessary to ensure the cleanliness of the water. Usually, it is necessary to change water once a week, and the amount of water changed each time is controlled at one quarter of the total amount of water. If conditions permit, it is recommended to install a circulating filtration system to reduce the frequency of water change.

The best water temperature for Arowana is between 24-28 ℃. They are sensitive to environmental changes. If the temperature difference exceeds 1 ℃, they will feel uncomfortable. If the water temperature is lower than 22 ℃, they will have reduced activity and loss of appetite. If the water temperature is higher than 31 ℃, they will become irritable, and some will bump into tanks. When it is hot in summer, breeders need to transfer them to air-conditioned rooms to cool down, so as to avoid problems such as cylinder collision and cylinder jumping when the temperature is too high. In winter, it is best to install a heating rod to keep the water temperature in a constant range, so as to avoid discomfort caused by too much temperature difference.