Could be cyphastrea, the septa around the retracted polyps does make it look that way. If I recall they can also produce planula asexually, though I've never heard of it in captivity (doesn't mean it doesn't happen).
I've had some poci babies encrust upwards of 1/2" before growing out, so it could still likely be that. I'm still leaning that direction because of the polyp size and density.
Tim, is the whole thing metallic green?
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