Werid Thing Found on Live Rock

[JacobNeighbors]

I found this dark red soft creature on my live rock. It seems like a bivalve with a tube opening at the top. React to light and contract when I point the flashlight on it. Wonder what is it and is it reef safe?
Thanks.
Here is a video of it.

 

[Tahoe61]

Ooo. This is a good one, but I have no clue. Could it be a Tunicate? Is it stationary?

 

[JacobNeighbors]

Ooo. This is a good one, but I have no clue. Could it be a Tunicate? Is it stationary?

Yes it is stationary! I don’t know if tunicates can move like that tho never kept one before.

 

[ileolai]

sea squirt, do you know where the rock was sourced from? this may give an idea as to species

 

[Softhammer]

Could be a boring clam mantle as well. There are many species that burrow into rock.