Help identiying coral - I think?

[BBucKK]

Hi

Purchased a blue sponge at my LFS and when I get it in the tank, I noticed something on the rock it came on move. Closer look and there is that I think may be a soft coral in between the blue sponge. It has two openings i can see that open and close - they almost look like mouths. The whole thing will retract if something gets close. It is only about half an inch tall. Can ne1 tell me what this is?

Thanks in advance

BBucKK

 

[mcgyvr]

I really can't see from those pics.
maybe a tunicate or another sponge?

 

[miranda1960]

if you mean the brown thing i think a tunicate