What is this help plz

[Hethari]

I had a Zoa island that start to vanish polyp by polyp I try every dip no benefit near its end I took it away put it in high peroxide and left it overnight and this what came out and still alive

Is this eating my Zoa

 

[pugcrush]

Bristleworm; I wouldn't think so. Can you explain more of what's happening? How many polyps lost & in what time frame?

 

[Hethari]

Ok this is my third colony that die all my parameter are ok all other coral ok just the zoa loosing polyps day after day

 

[Lionfish Lair]

That's probably a eunicid.

 

[Hethari]

Yes I think it's a eucinid

 

[Hethari]

It has antennae