Did my Christmas Tree Worms spawn? Or are they something else?

BRS
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So today I moved my Christmas Tree Rock to my new display from the frag tank and I noticed 3 new, VERY skinny tubes. This caught me by surprise as I never saw these before and thought they might've been old tubes of deceased worms. But looking closer, I saw little worms pop in and out of the tubes. The strange thing is that they're all about equally spread out, they have no color to them, they're kind of a light gray color. I talked with a person I know who volunteers at the Aquarium of The Pacific and they speculate it could be another species of Serpulid (tube) worm. I'll be documenting this whole thing since I find it strange they have no color, maybe they develop color later in life? If it is another species of tube worm, it'll be really interesting to see the cohabitation.
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Here's a video of it popping back in, the quality isn't the greatest since it's super duper tiny but i hope you can get an idea of what it looks like
 

vetteguy53081

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Tube worms. Very common and they generally send out a fan in search of food
 
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Tube worms. Very common and they generally send out a fan in search of food
Oh, I've never had this kind before. Do they get bigger or stay this small forever? Really weird to see them growing on a porites, or how they even got onto the porites since I don't have them in my frag tank either
 

vetteguy53081

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Oh, I've never had this kind before. Do they get bigger or stay this small forever? Really weird to see them growing on a porites, or how they even got onto the porites since I don't have them in my frag tank either
Stay small but can mutliply
 
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