What is this white spiderweb-like thing?

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stan255

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What is this white spiderweb-like thing? It’s in my overflow box.

IMG_0534.jpeg
 
What is this white spiderweb-like thing? It’s in my overflow box.

IMG_0534.jpeg
I got that all over the sump and in darker spots in the display. Always thought it was a sponge. My live rock is from Cairns, definitely doesn't do any harm.
 

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