Pachyseris, Pavona, Merulina or something else?

[ScubaSteve]

That's a tough one, especially while it is still this small. You may have to wait a bit to see what growth form it takes to really get the right ID. But...

If it were a Pavona, it's likely a pavona varians. There is also a good chance that it's a merulina... however, it's tough to say right now as both the pavona and merulina start as encrusting and then develop their characteristic shapes later on. I don't think it's a Pachyseris Sp..

Do you have a rough geographical location?