ID on worm/tentacle thing please

[switch]

I have seen these things coming out the rock over a week now but only today I saw them move and more then 2 tentacles so I think its a worm. The pics aren't the best because its sort of up the back of my tank sorry. So anyone know what it might be?

 

[switch]

Pic 2

 

[switch]

Pic 3
Different angle but not as focus

 

[rangermonroe]

It looks like baby serpent stars.
There is also some other kind of star that stays small. I have those living in my live rock as well, and what you photographes is all I have ever seen mine do.

 

[sammystingray]

Definately seastars. They are holding out their arms to filter feed from whatever they can catch out of the water.

 

[crackah]

so thats what they are
i have 1 growing in my rock. cant get a pic rite now but its leg is less than a 1/4 inch long. will my other serpent star eat it though seeing how he is full size?

 

[poprfd]

That is deffinetly a serpent star i also have one in my rock