Found this in tank

maikoa02

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#9
Get an angelfish and they will devour your sponge. But they might also devour your zoas, clams, and any meaty corals like acans.
 

ilyad

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My Tank Build
#10
As others have said, it is a sponge. Since that one is out of water, its hart to tel for sure, but it sure looks a lot like some of them are a pineapple sponge. I have a bunch of these in my overflow and some in the sump... when I turn my return pump off and then back on, a bunch of them come loose and go into places.
 
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