GSP growing in empty shell?

[Turtleman87]

Is this a GSP growing in an empty shell? Lol I'm new to reefing so just making sure that's what it is.

 

[Lost in the Sauce]

That is what it appears to be.

 

[BanjoBandito]

GSP grows everywhere. lol.

 

[Turtleman87]

GSP grows everywhere. lol.

Apparently lol

 

[Gordi]

Apparently lol

Not in my tank. I have zoas, palys, mushrooms, LPS and sps all seemingly doing okay but the GSP just won't grow. Today it's down to about 12 polyps , down from maybe 40 a week ago.
Still, it's not dead.