strange creature attacks!

mygreengoldfish

AC Members
Jul 26, 2004
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Berkeley, CA
A few minutes after the lights went out, I reached into my aquarium to pull some algae off some star polyps when a small, sticky tentacle grabbed my finger. The tentacles are segmented and have small bristles and look like very thin legs of a brittle star. The tentacles are coming out of a rock that I recently placed in my tank that had the star polyps attached. Any clue to what this is?
 
The holes look like nothing else could fit in and the tentacles are spaced apart but if you are right than this is the third hitchhiker on the coral rock after two feather dusters I found. Thanks
 
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