Help identifying white crystal/webbing on rocks

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spaghettinick

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This white stuff has been growing in the underside of my rocks and behind some corals. Thought it was just some sort of sponge, but looking for confirmation.

IMG_3850.jpeg IMG_3849.jpeg IMG_3847.jpeg IMG_3846.jpeg
 
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WHAT’S USUALLY THE FIRST CLUE THAT SOMETHING IS OFF IN YOUR REEF?

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