It's cold, how to raise clown fish?

First of all, you should distinguish your species and understand their habits. When the weather is cold, of course, you should prepare a heater. Then, in order to ensure the accuracy of seawater salinity, an optical salinity meter can be prepared and a shelter can be placed. If you are a pair of clown fish, forget it. After the shelter, they will do shameful things in the shelter.