I would have to agree with Carp. When mine have sprouted new polyps, it is usually from the base or side of an established polyp. That pic looks like the PH is sucking it in.
Yeah I can see where you guys think that it's getting sucked in to the powerhead, but the picture is super deceiving. The powerhead is actually a good 2 inches behind the coral. You also have to remember that the coral was not open when it did this. It was hard. It opens at night. It sent these stringers?? out and met at the other location. I'll let you know what becomes.