What are these tube looking things on my rock?

Mbrusiloff

Reefing newb
Any ideas?!
 

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they look cool. have to say never seen anything like it.
the calcium tubes from tube worms are usually white and fairly rudimentary - these look more intricate. are they hard or soft (poke it with something).
 
They are white when they are formed, as they age they change color same as LR does. I have had some that were a deep gray and very old tubes. They were also dead.
 
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