Coral with white hard surface

leng1986

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Hello people, can you all help to identify what is the white stuff growing in my coral? Is hard when i poke it.

IMG_3322.jpeg IMG_3324.jpeg
 

ISpeakForTheSeas

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Welcome to Reef2Reef!

If it's hard, I'd guess it's the coral's skeleton, but pics under white light may help with saying for sure.
 
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Freshwater filter only or is it? Have you ever used an HOB filter on a saltwater tank?

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