How to introduce new clown fish

[Jazeel55]

I have a 210 gallon system i what to introduce another pair of clown fish. I presently have a pair of Clarkie. I ah R had them for 3 years. My female is about 5 inches and very very mean!!! Is it possible to add another pair

 

[HARRYMANIA]

clowns are very territorial i have had many at once key word at once .if you have dominant clowns for years , i personally would not upset the flow. there are so many other varities to choose from why push it.