Hitchhiker identification?

[MartyG]

I put this BioCube together about 3 weeks ago and I've noticed some things that have come alive on the live rock - can anyone help me identify? The last picture has some tiny legs or tentacles sticking out from the rocks, starfish?

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[hotelbravo]

Maybe you can circle what you are talking about cause all I see is a mushroom coral

 

[Ron Reefman]

+1
I'm with Hodge on this. I don't see any 'legs'.

 

[eastlake]

Maybe you can circle what you are talking about cause all I see is a mushroom coral

This, and a couple of those even look like yumas!

 

[SeaCucumberFan]

I agree with mushroom corals and not seeing tentacles