Can you mix two different breeds of clownfish?

[l3xxx]

I have 3 Clarkii Clownfish. I have a full size adult which is pretty big and 2 smaller ones. From the 2 smaller ones one is very small compared to the other, kinda looks like a baby. Im wondering if I could add either false or true percula clownfish into the tank to add more color. I'm not sure if they are going to be aggresive with eachother though. Should I or should I not try to mix?

 

[Anonymous]

I would NOT try it unless your tank is fairly large (180 or bigger). The disparity in sizes of the Clarkiis (a rather aggressive species) is because you've got a dominant female and her harem of subdominant males.

 

[l3xxx]

I only have a 20 gallon tank. I guess I'm gonna have to pass on the idea of mixing them. I'll just wait until they die out. (not trying to say that I'm gonna kill them, lol)