help with an ID please

[Tonycip]

I'v just started indulging in sps and ,is there any like rule to go by ?
Heres a pic . thanks in advance.

it looks happy..

 

[Whisperer]

Robusta is the first thing I thought it was.

 

[Tonycip]

thanks. I don't think thats it. how about green staghorn acropora? anybody agree with that.

 

[Whisperer]

That's generic name. Any acropora that is green and leggy can be called that.