Heteractis Aurora
It's definitely E. crucifer. Can't be H. aurora since all of Richard's rock and livestock come from off the coast of Florida.
That thing was that big when in came in on your rock?
What are you feeding it?
How did you pry him off to move him originally?
And do they prefer to be closer to the sand or higher up in the rocks? I'm just wondering if I should move mine.
I think it's cool that it started to color up after a while, mine is snow white right now.