Help Id'ing this Aussie Coral

Got this guy for free from my lfs because it was half dead in their tank so I asked them if I could have it because they were talking about throwing it away. Apparently it came in as an extra and they didn't order it and don't know what it is. I'd like to know what it is so I can properly care for it. It's actually bouncing back quite nicely so far. The order was from Australia and I think it may be an Australomussa but I'm really not sure. Any help will be appreciated. Thanks.

 

Looks like some sort of open brain; maybe a doughnut brain.

 

That's a pretty good guess. I agree with you. Looks like it will be quite beautiful when recovered.