Skeleton? GSP is a soft coral. If it has a true hard skeleton you may have pipe organ. If you kill it with JJ it will likely melt away. I also had accidental success killing it with a 10 minute FW "dip"
, the polyps pretty much exploded, the purple part eventually turned black and melted away. Who says mistakes aren't useful, eh?
Personally I think you should peel it off and give it away then kill then remnants if you don't want it. Up to you, I just hate to kill things unless is aptasia or something.....