what the heck are these?

Mattyice008

Reefing newb
So I had taken my frogspawn out to do some moving, and in the process I found these white tube things on the rock. They are very hard, and I accidently broke a piece off of one. As you can see, they have these clear white feathery things coming out of the end.
Any ideas? Are they bad? because my frogspawn hasn't been opening up as much

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pretty sure there tube worms.
i dont think theyre bad. i have a shitload of em in my sump.
theyre in my dt also.
 
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