Yesterday I added two species of clownfish as the first fish in my 210. I added a mated pair of true percs, as well a pair of ocellaris. I anticipated some jousting for territory soon followed by the pairs separating by species. However, ever since their introduction, the two pairs have been schooling together with no apparent aggression! I find this very strange as I would expect the two species to mix like oil and water at first. I might even be able to understand this if they were all juveniles, but the percs are an established pair. Has anyone ever heard of, or observed this behavior??