Help ID what’s is growing next to my Zoa?

[osvaldogarza21]

Should I be concerned about the thing growing next to the Zoa frag? In addition how should one go about removing it?

Thanks for any help.

 

[KrisReef]

Looks like a deadly Zoa constrictor,
but it also looks like a sponge?

 

[Anchor]

I looks like a purple sponge? I think it might be the photosynthetic type. IDK for sure. I would be more worried about those rockflowers killing your zoas