I agree that Joyce's clowns are the same species, as are mine. And yes this is off topic from the original post. I apologized for that already, and do so again.
No mine have not started spawning, and I am aware that if that happens it could change the level of aggression. But as Joyce did, so might I. If they even spawn. My tank has enough mates in it to keep the horniest clowns from spawning.
Now it was mentioned that when the clarkii's started spawning they turned on the third, This falls in line with the general rule of no more than two clowns. As Joyce stated, only ocellaris can be kept with more clowns outside of the pair, and only one pair will form in a tank. And that was the point I was trying to make.
I haven't tried keeping different species of clowns together, and yes it appears to be difficult from what I have read, but it also appears that it can be done. Back to Seaworthy's question, it maybe be possible to mix the two species. If they are tue perculas, this might be a problem as Joyce stated they are actually quite aggressive, and would give a maroon clown a good fight. Given that perculas are a little less common, and a little more expensive, you might not want to risk adding the tomato. If they are ocellaris, given that the tomato is the more aggressive fish, and being added second, there might be a chance of making it work. But mixing any two different species of clowns is a risky venture.
And that is my humble opinon, which I should also note is drawn more from lots of reading rather than actual practice. If you proceed to keep these clowns together, good luck to you, I hope it all works out.
I currently keep a trio of ocellaris, a relatively new pair of ocellaris, and am trying to form a pair of maroon clowns. Yes they are all in different tanks.
I don't mean to imply that anything anyone said in this thread is wrong, but it seems in this hobby there are few absolutes, as there is always somebody breaking a rule. And if people didn't try new things, we might still be driving around on square wheels. I hate to think of that, as my MPG is already not so hot.