Thats a beautiful piece, yea it is, some pectinia i come across has raised circles as a mouth, some have a dip just like yours. But what i can bet on is if you dont move it, both those corals to the left are going to get the most horrible sweeper tentical treatment
Yea, i Had moved them around, but none of them have had problems with the tentacles yet, the pectinia have yet to send out tentacles longer than 1/4 inch only when i feed it and just around its mouth and the welsoni has not been aggresive either
Look at the branches, you might find some eyes on them. Also look at nighttime, the sweeper come out from under the eyes so that should tell if you have more
I have looked at night and it really doesn't send out any sweepers whenever I check on it, also there are no eyes right now on any of the branches from what i can see.