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ID help with brown/black banded growth.

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I've tried and cannot work out what this is. It has what looks like the underside of a mushroom (like multiple fins) main body and a banded tentacle. I have touched with probe and is is soft but doesn't react.


This is in my new 15 litre pico reef. The liverock came from LFS and was well cured. I have a colony of zoas and some GSP. 

I have no recent water parameters. 

Photos r best I can get. 




Edited by Ronoc
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Probably a sponge.

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