Anyone even seen this growing on a Hammer?

[ReefRebels]

Good morning Reefers,

I've had this little pink hammer since mid April. It, like all my hammers is a pretty happy hammer and I did dip him in CoralRX before I placed him in the tank. He always had a little dark spot but since April that dark spot has grown and its clearly some little pest. Its not causing extreme harm but the hammer is showing some minor stress in the form of opening but opening at 90 to 80 percent of what he use to. Anyone know what it is? I was planning on doing another CoralRX dip and maybe try to scrape it off but wanted to see if anyone knew what this thing was and if another treatment made more sense.

Photos below are taken in natural light around 8:30am this morning, so none of the hammers on this rock open up until a good hour or so after the lights come on. No other hammer has this.

Thanks everyone.

 

[william Lutman]

Snail

 

[19Mateo83]

Vermitid snail. Scrape it off or superglue the end of the tube closed.

 

[ReefRebels]

Ok, I wasn't sure cause it didn't look like any vermitid I'd ever seen before. Thank you.