Thanks!
Well, I only know that the polyps on the walls originated from the yellow tubastrea at the right-hand side of the tank, about 7-8 months ago(it was alone at that time). I'm not sure it spawned, as at the same time it lost a number of polyps. I've read somewhere that it may be possible for the polyps to leave the colony when under stress.Just my 2c... Other opinions?
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