id please

i have know idea what this is called i have it both of my tanks one pic of rock has 2 things on it


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so those will "grow' (lack of a better term) from seemingly nothing in a tank?

Just curious and thank you in advance Scott (ashlar)
 
Yup, they're hitchhikers on corals and live rock. Even quite "cooked" live rock will have sponges pop up, as some sponges produce a thick substance that keeps them from drying out.
 
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