Not melting just looks stressed is anything stinging it ? or fish picking at it ?
I have seen nothing bothering it, and no other coral is close enough to touch it.
If i'm not too tired, i'll move it to my other tank tonight, dipping along the way.
Yes they do in the center of them, but there are also a few different varieties of Duncan. I've got three different ones in my tank.
Check your alk and calcium. Mine would loom like that if the levels got to low.