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Originally posted by Sheol
I don't think the piebald Favia was a compound colony, rather just looks like there was gene drift in some of the dividing polyps. I don't know if different colonies would tolerate each other Al G Blenny ( neat handle BTW.)
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Look at how the red and light green section seems to have polyps reaching over the darker green section. Then look at the brown section at the very bottom. It looks like it is trying to grow over the green section to the left. I still think they are different colonies that just happened to meet at "four corners". I don't know what a "gene drift" is. I don't know if that is possible in four different sections of the same colony. Corals grow together all the time. Just because they are killing each other off that easily doesn't mean they aren't fighting. If they can tolerate the others toxins they will just be fighting for surface space and light.