Unknown creature

[Zaccolwlell]

I found this stat looking thing on my month old live rock. Any clues? The orange thing with two legs.

 

[triggreef]

Tunicate or sponge? Tough to tell from the pics.

 

[Zaccolwlell]

The tip of them open up and close when startled

 

[Calappidae]

Tunicate.