Did a reverse google image search and found this. Fluted moon coral. Part of the faviidae family
Fluted Moon Coral Barabattoia from WA Appears in Wild Colors | Reef Builders | The Reef and Saltwater Aquarium Blog
Barabattoia, the ‘Fluted Moon Coral’ is part of a large group of stony corals belonging to the family Faviidae. We’re all mostly familiar with Favia and Favites moon brains but if you know what to…reefbuilders.com
I wonder if it's from a cooler water habitat kinda like the wilsoni corals found out there?