What happen to my Elegance coral?

[Giang]

I have this elegance coral in about 8 days and my tank is 2 months. It had been opened widely since the first time I put it In the tank. But two recently days, it starts to close and seems now it has closed completely. I noticed my yellow goby stays on the coral. Also down in the bottom of the coral(see in the first pic) also has some kind of worm that are growing all over my live rock. I’m not sure if my coral is Ok or are there any other critters that harm my coral? should I move it to a different place?

 

[James M]

The worms are feather dusters...harmless filter feeders
It looks like the clown goby is irritating it

 

[homer1475]

The worms are feather dusters...harmless filter feeders
It looks like the clown goby is irritating it

+1
My observation as well.

 

[ShaunRobinson]

+1 for either the goby or the clowns irritating or possibly the goby picking at it? Also I have always kept cats on the sand. It may be bothered by sharp rock when it opens out fully.