Any ideas looks like a tube worm

[JPags]

But it keeps spitting out these stringy strands at the Kenya tree next to it

 

[BiGGiePauls33]

Vermetid snail??

 

[coralfishreef]

Looks like vermetid.

Vermetid Worm | Melev's Reef

Most hobbyists encounter a strange calcified tube with a web coming out of it, which is usually noticed during tank feedings. The web is cast by a Vermetid, a snail that uses the web to capture particulate-sized foods in the water column. Using its jaws, it consumes the web with the food...

www.melevsreef.com

 

[JPags]

So I should remove them

 

[Chlorinated]

Yes. They spread rapidly and irritate corals

 

[JPags]

They are on a single rock right now so thats easy to get out. Will keep an eye out for them.