Can clownfish be kept in freshwater?

Clownfish cannot be kept in freshwater, because they are saltwater fish and very sensitive to seawater salinity; a freshwater environment is bad for them and can even kill the fish. Clownfish are generally kept in water whose salinity is mixed from aquarium salt and seawater mix in the right ratio, or if water is easy to get, you can fetch seawater from the coast directly.

Also, clownfish like water around 25°C and need appropriate light, and you should keep the water quality stable. Finally, a clownfish that has been acclimated in freshwater might possibly be kept in freshwater.