I have a pretty big melanarus a small six line and a small yellow wrasse... never see them eating worms.
A grouper? Don't believe those are safe in my tank besides they get huge.
So I recently got a blue Linkia and an orange linkia, I believe the blue linkia was hurt or had a wound.... well the worms destroyed him... I can see one whole arm in the sand and the worms all over it. Don't see the rest of him anywhere. The orange one has been in the glass since I got it.