Help to ID this bug

[Manusarco]

I noticed some antennae on an acro. I looked at it with a magnifying glass and cut the branch, but the bug is still there! Does anyone know what it is? Is it harmful? Could it become an infestation?

 

[Reefer Matt]

Could be coral boring spionid worm. I have a few that come and go with no big problems. But sometimes they may multiply and stunt the coral.
https://www.reef2reef.com/threads/coral-boring-spionid-worms-anybody-killed-them.974826/

 

[chip shop]

From picture it definitely is

 

[Manusarco]

Could be coral boring spionid worm. I have a few that come and go with no big problems. But sometimes they may multiply and stunt the coral.
https://www.reef2reef.com/threads/coral-boring-spionid-worms-anybody-killed-them.974826/

Hi Reefer Matt, thanks for the link! definitely are boring spinoid worms! good read

After read all the topic and the hard solutions and risks, I decided to trashing the affected part to avoid the worm spread in the tank.

thanks again for the help, cheers mate.

 

[Manusarco]

This is the surgery results!

The worm is clearly visible lodged at the base of the acro and the tunnel in which it lives.