Acan worm?

[toadstoolbro]

I think this is an Acan worm I noticed it about 3 months ago and it's definitely stunting the growth of this piece. I've tried a 30 minute iodine dip and 2 minutes in 5:1 hydrogen peroxide neither have killed or removed it. And it just retracts into a hole in the skeleton when I've tried manual removal. My yellow coris wrasse won't touch it either. Am I dealing with something else with a different treatment?

 

[Gumbies R Us]

@ISpeakForTheSeas