Generally more than 30 cm, preferably less than 1 m, and the water depth should be adjusted according to the specific situation. Generally, when the temperature is high in summer, the water is deep.

Generally, the water depth is one meter to one meter five. Because when the water is at this depth, the temperature in the water is suitable, neither high nor low, and it is relatively stable. If the sun is too deep, it will be cold, and if the sun is too shallow, it will be hot and water, which is also harmful to loach.