Worm identification

[mourningsage]

Is anyone able to tell me what kind of worms these are.
I've had this coral piece for about a year now and have just seen these 2 larger what looks like filter worms coming out of the rock.

 

[ISpeakForTheSeas]

Welcome to Reef2Reef!

Those are Pineapple Sponges (genus Sycon); they're common, harmless, filter-feeders. They tend to boom then bust in population, eventually going away on their own without intervention.

 

[Cichlid Dad]

I forgot the name of the other little spiral worms you have there but also harmless and are in every tank I've owned for at least a while. Also filter feeders.