Little Red buggers on LR..

[SEAG]

Hello,
I was wondering, I have a couple of these little red creatures on my LR. They are about half the size of a dime, dome shaped with two "valves" on them. The valves look like tunnels. If you get too close they will shrivel up and slowly fill out again...I tried to take a pic, but it was too blurry.

Any ideas?
Sean

PS any good sites out there to ID these things? and also to read up on different fish?

[Sugar Magnolia]

Those could either be tunicates http://www.wetwebmedia.com/ascidians.htm

or sponges http://www.wetwebmedia.com/sponges.htm

[SEAG]

Okay..here is a picture..it is the guy in the middle...never mind..the file is 702kb...