Hard pink encrusting on octospawn

[nathan212178]

I had had got back from the lfs, I noticed this and asked one of the employees but they said they didn’t know either but I know it’s been there for a bit and hasn’t seem to bother the coral
It has a clear tentacle spurting outward like a worm not really sure what it could be, there’s more on the back but smaller

Also, I’m about to dip, if it’s not harmful I’ll keep it maybe

 

[EeyoreIsMySpiritAnimal]

It the "tentacle" hard as well? Could be a vermetid. Do you have pics of the others?
Does the tentacle pop in and out and "wave" at you? If so, it's probably a barnacle.
My instinct would be to remove it/them, but if you're dipping, it might kill them anyway.

 

[nathan212178]

It the "tentacle" hard as well? Could be a vermetid. Do you have pics of the others?
Does the tentacle pop in and out and "wave" at you? If so, it's probably a barnacle.
My instinct would be to remove it/them, but if you're dipping, it might kill them anyway.

It’s wavy, like there’s the hard pink area and under it comes out a small thin clear tube that waves around, if it’s a barnical I’d like to keep it but again not sure, would like it for it’s filter feeding lol but I’ll most likely take it off

 

[geoljills]

Where did the coral originate? Was it aquacultured or taken from a region of the ocean?

 

[geoljills]

It almost looks like a brachiopod, which would have two shell halves with a "pedicle" - a tentacle-like or worm-like stalk extending from a hole between the two halves of shell. I have never seen one in a reef tank before, though. They are filter feeders and would need to be target fed.

https://www.ryanphotographic.com/Brachiopoda.htm