What is this on my live rock?

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Xathos

Aquarium Advice Apprentice
Joined
Mar 14, 2011
Messages
38
Location
Edmonton, AB, Canada
Just wondering what this is on my rock. Anyone know? Sorry for the bad quality pictures.
 

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Oops. Thanks for moving it to the right forum. Yea, probably a sponge, but I'd like to be 100% sure especially since I haven't added any fish to the tank yet.
 
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