This area right here. It’s white and looks like the gills on a mushroom. They are hard and little green dots just started showing up on it. Like coral neon green.
That looks like a calcifying coral. I can't tell what kind from the photo though, different light settings may help someone identify it. Looks a bit like leptoseris.
First 2 are where the the green dots are showing up. Other 2 are the same rock but these are turn8ng brown. Tank is 7 weeks old but this was live rock added.