The optimal range of water temperature for clownfish is between 26-27℃, the specific gravity of seawater is 1.022-1.023, the pH value of seawater is between 8.0-8.5, and the water hardness is 7-9 degrees dh. As one of the most heat-tolerant saltwater fish, clownfish have an extremely wide range of temperature adaptations. The minimum temperature for keeping clownfish is 18℃, and the maximum acceptable temperature for clownfish is below 35℃.

Although the clownfish accepts a wide range of temperature, it is best to control the temperature between 26-27°C for a long time. Temperature also affects the growth, development and reproduction of clownfish. Only at the most suitable temperature can clownfish grow and reproduce normally. When the temperature is extremely low, the clownfish is not very active and does not like to eat. Basically, it enters a state of self-protection of the fish body and waits for the temperature to rise. When the temperature is too high, the clownfish will become quite active and more aggressive. Of course, except for some special high and low temperature conditions, for example, high water temperature is required to treat white spot worms, and low water temperature is required to treat bacterial infections.