What is it?

[kopczynski]

I noticed this mushroom or anemone like thing on a piece of live rock anyone know what it is?

 

[pegasus]

It's hard to tell. The pic's too fuzzy to get much detail about the tentacles. The clam in front isn't helping, either... lol! What would you estimate as it's diameter?

 

[kopczynski]

3/4 of an inch. I cant tell if it has a skeleton. Its green with purple tentacles and they are sort of translucent.