ID of growth on a coral

TiggrReefer

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What is this white-ish growth on the bottom of this piece of coral?
Good?
Bad?
Try to remove??
IMG_3543.jpeg
 

ISpeakForTheSeas

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My best guess would be a sponge, as it looks too large to be mesenterial filaments, but I can't tell for sure from the pic - sorry.

If it is a sponge and the coral isn't acting unusually unhappy in the areas close to it, then it's most likely harmless.
 

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