Any guess on what this is?

[MKCindy]

I found this thing in my tank today, sorry the pictures aren't great, it is very small in the center of the pictures. It is shaped like a closed polyp, very securely attached to the rock. It is defiantly red and completely see-thru with a small opening (mouth??) of small orange teeth. (they look kinda like the mouth on a Venus Fly Trap)
It doesn't retract when I touch it with my poker.
Any ideas?

[blindside]

I can't see very well in this pic, but it might be a tunicate?

[Texreefer]

That would be my guess as well

[MKCindy]

Thanks, it stayed there for 2 days then disappeared.