Sponge, tunicate?

[zdrc]

What are these little orange things? I think a few came in on live rock, but in the last 5 days, they've increased in numbers quite a bit. They have an obvious opening at the top making me think sponge or tunicate.

 

[Goaway]

Sponges wont collapse. Tunicates will. Irritate them with a turkey baster and see if they close at all. If not, my guess is on sponge.

 

[damsels are not mean]

Possibly forams

 

[zdrc]

Sponges wont collapse. Tunicates will. Irritate them with a turkey baster and see if they close at all. If not, my guess is on sponge.

I just took the rock out to hunt for crabs and all the orange guys retracted into the rock. Must be tunicates!

 

[Goaway]

With that response, they wouldn't be foraminifera. Either way, I like tunicates much more than sponges. They wont fight coral over territory. I am sure there are other possibilities of what they could be.
If they don't move on their own. I wouldn't call them a pest.