hitch hiker on clam shell

calvinci

In Memoriam
There is some unidentify hitch hiker on the side of my crocea. It looks like attach to the shell, looks like some sponge, tube worm with 2 tentacles. Refer to the photo :

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and

?
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Anyone know what is this and should I get rid of it? How to get rid of it if I have to. It jump from the rock several times, I am not sure if this peel off of the shell is due to the fall. Will this effect it's health
 
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