Whats this? looks like sps maybe?

[Nano]

Its growing on this rock for about 3 months very small, then I moved it into the light and it is growing way quicker! It almost looks like some sps of some type(probably not), its hard, and glows some what under actinics. it looks like its branchy kind of and as said is quite hard. ignore the little aiptasia! I have to kill it once it gets a bit bigger. or maybe I'll keep it and feed it and get it nice and fat... not.