Is this a sponge?

[DI68]

Hi I noticed this initially as a white round 'blob' but it has now opened up with tubes and there are more around on other rocks. Is this a sponge?


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[Ricksreef]

Definetly sponge.Nice looking corals and rock.


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[DI68]

Thanks..and thanks for the ID...a relief.


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[damedash80]

Definitely a sponge!!! Free filtration lol


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