Strange hitchhiker on Live rock

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Saltwater T

Aquarium Advice Apprentice
Joined
Nov 10, 2007
Messages
17
I discovered this shortly after adding rock to tank. It has been there for about three weeks. Please try to ID it so i know if it is harmful or not. Looks like a sphere with a hole down the center. It is very soft and squishy.

Thanks
 

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Better pics (Hopefully) :)
 

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It is hard to tell with the pics but from the discription I am leaning to sponge or tunicate ... can you see 2 holes in it
 
I'm with Sadie, some sort of sponge or tunicate.
 
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