ID Please??

[Sunee]

Hi, I noticed this creature a while ago and am wondering if anyone can ID it. It is about 1 1/2 to 2 inches high, flexible (moves in the current) and is attached to the rock. The base is roundish and is starting to be covered by coralline algae. Sorry the picture is not clearer but it is in a crevice at the back of the tank - hard to get a good picture. Thanks.