Smoking Zoanthid

I have what I think is some type of zoanthid? It was a hitchhiker on a piece of LR. I’ve had it for about six months & it’s been growing in size until just recently it started to shrivel up & does not open up anymore? I just noticed this afternoon that there was what looked like white smoke coming from two of the steams? I will attach a pic from several months ago when I borrowed a camera from a friend.

Any ideas ? Here are my current water specks: PH = 8.2 / PO4 = 0.3 / NO2 = 0 / NO3 = 2 / NH3 = 0 / SG = 1.025 / Temp 82 degrees / The Ca is low 340 I need to get a new Ca test kit before I try to raise it!