Black polyp on frag plug

[plexx]

I had these for a while must have come in on frag plug, I have tried to get rid of them but they come back . I have nevere seen what looks like a black star polyp before ( that's the only thing I can think of) , what do you guys think?

 

[Tamberav]

Pic is dark but night be some type of Sarcothelia coral. They can be super invasive.

 

[fishguy242]

hi,sympodium??

 

[plexx]

Will try to get better pic. They don't bother other corals but it spreads very fast

 

[plexx]

I googled Sarcothelia coral thats what they look like.

 

[reef lover]

+1 very invasive

 

[plexx]

I think I may have to ditch the frag and cut off the piece of rock it's on.