What coral is this?

[207Meg]

I bought this as a Devils Hand coral from a local hobbyist. Started off the size of a quarter four years ago. It's now six inches across, but flat, always flat. When do they start to get the interesting folds? Or is this just a toadstool?

 

[tryingtoreef]

My money is on toadstool

 

[CeylonCorals]

I think it's a leather toadstool

 

[Tahoe61]

Sacrophyton/Toadstool/Leather.