frag rock came alive, some kind of coral?

[errand]

I have gotten some very pretty wild zoas on a piece of what looked like some dead coral [from northern Australia], and after about 2 weeks it looks like the 'dead' coral the zoas are growing on has come alive. Its orange/brownish and looks like tiny tiny flowers. The zoas are awesome I love them, but does anyone know what this is and if it will hurt the zoas?

Before it came alive it looked like a rock, with little pock marks in it, little pits. There is something growing from the pits now.

[jservedio]

Looks like an encrusting monti or porites to me.