I believe this is a Physogyra coral (closely related to Plerogyra), and I received it on 8 February 2020 in quite bad condition. Most of the tissue was rotting along the edges, and the skeleton was exposed.
By 9 May 2020, the coral was no longer receding, had polyp expansion, and was starting to regrow over its old skeleton.
Here the coral is fluorescing under actinic lighting.
Only three months later, and this Physogyra was well on its way to full recovery!
This dying coral (Homophyllia bowerbanki) was found injured at a local fish store on 10 February 2013. A fish had been nipping at it, which made diagnosis easy. This was a low risk rescue for me, and Homophyllia bowerbanki is my favorite species of coral – a win!
By 31 March 2013, the coral was recovering nicely.
The coral recovered after four months (15 June 2013).
As the coral flourished, so did its colors (2 November 2013). Never did I expect a stunner like this!!