Critter ID please??

[Fishwife]

Just saw this under my Goniopora. I have had this Goniopora for 7 months, have never seen this before!
Good/Bad? Ready to pull it out because it looks scary! I have not seen it move since the short time I have seen it.

 

[KJ]

Hard to tell from the pic!

 

[Waynerock]

Looks like an arm of an astrinia* star. Sorry spelling is not my forte ( I am a victim of the California school system)[emoji4]

 

[Craigdoc]

Looks like an arm of an astrinia* star. Sorry spelling is not my forte ( I am a victim of the California school system)[emoji4]

This was my initial thought to but without a better picture its hard to be 100%

Some astrina stars are OK and some are not, in my personal experience they've always been OK and never bother corals or get out of hand numbers wise, but some do munch on corals and depending on the availability of food there numbers might get out of hand

 

[Fishwife]

Looks like an arm of an astrinia* star. Sorry spelling is not my forte ( I am a victim of the California school system)[emoji4]

I think you are right. I looked underneath, and I think that is what it is.