Worm or Vermetid snail or something else?

[Limpet]

I recently received some frags from WWC. Right away I noticed what looks like swaying antenna. I didn't dip them. I tried to glue them shut but they returned a few days later. Any ideas? Would dipping kill them?
I had a massive Vermetid problem a while back but don't remember the antenna being this long.

 

[aKlevans]

I recently received some frags from WWC. Right away I noticed what looks like swaying antenna. I didn't dip them. I tried to glue them shut but they returned a few days later. Any ideas? Would dipping kill them?
I had a massive Vermetid problem a while back but don't remember the antenna being this long.

spinoid worm, harmless

 

[Limpet]

spinoid worm, harmless

Thanks. Good to know. Leave it be or get rid of them while there are only a few?

 

[aKlevans]

Thanks. Good to know. Leave it be or get rid of them while there are only a few?

I would leave it be. They are usually non-invasive and are a sign of a healthy tank if they survive, similar to feather dusters.