its semi hard to get a great picture since I have a bow front tank and whatever it is is facing forward on the rock.
It has long tentacles that come off of it at night.
Here is a picture from when it was less than an inch....
A lepthastrea has invididual eyes every cm or so. Psammacora doesn't really have feeders like that.
Not a plate or fragilis for sure.
A litho has ridges, then feeders.