I've got the same thing going on in my tank from a pocillopora that I got from Reefer Rob (happened in his tank too). They've kind of becoming a pest... In most cases my other coral can out compete them for space but they are encroaching on a few colonies. They're also really hard to chip off of the rock in most places. My favorites though are the ones growing up at the surface of the water on my plumbing returns. I'll try and get a picture sometime.
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