Ok, I got more pictures. A little disappointed in the way they turned out, but it's the best I could get.
First, just so people don't feel like I ignore my tank, this is all I see when I normally look at the tank. Hopefully it explains why it could get so big without me noticing it.
And now.... for the big one.... again, I apologize for the poor quality. I used my acrylic rod (everyone with an aquarium should have one) to push back the main coral polyps and got this. It's more clear in person looking through the lens but I am now confident that this is some mutation of the coral. The polyps have a very similar structure and are taking on the same pink coloring around them as on the mother coral it is growing on. Very curious to see how it continues to grow.