Sponge?

4kidsandapug

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I’m certain this is a type of sponge but unsure what category to place it. I have a few around the tank but this is the biggest by far- actually quite colorful, white with almost a green/purple pearl sheen to it. (Hard to see in the pics)

Any help would be appreciated.

90E23E9F-DA4F-4E3D-ADC0-F7594AFB0319.jpeg
 

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