I have basically the same problem and posted a question regarding it. I bought a gorgonian combo plug from GARF. I also do not know the names. The one who won't come out and play is flat and skinny and has light brown polyps that come out either side (or did come out). The other ones are...
I have a Gorgonian that has not opened up his polyps for over a week now. I bought him as a combo with two other gorgonians on a plug. The others are doing fine right next to it, but this one won't come out. This one is very skinny and the polyps stick out either side. The other ones are round...