Guy at LFS originally said favia, probably because it was closed up at the time. I was thinking some type goniopora too after it started to expand, but couldn't find any reference photos that looked close. Thx for the suggestions.
Not sympodium. Sympodium is lumpier when the polyps are retracted, and looks like a tightly packed clove polyp when polyps are extended. Also, sympodium is a soft coral, and I'm guessing by the looks of it that this is a stony coral.