glad to see someone with a respectable amount of experience daring to mix pairs in a single tank. The ultimate in clownfish taboo. I have been keeping several pairs together for the past year + also. Recently combined a rediculously complex group of clowns into a single 120 gallon. 3 weeks, so far so good. In fact, they seem to have settled into a peaceful community. I found that lots of anemone seems to limit aggression between the different pairs. I have 4 pairs plus 3 stragglers with 9 anemones to choose from- 3 haddon's, 3 ritteri's , 2 small LTAs and a pizza.
How do you have the tank set up? I can see a haddon's in the pic, but the clowns all seem to be hanging in the big Sinularia. Is that their preferred hangout?