Weird spongy stuff on rock

EvanDeVita

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Hi all, I just saw this weird spongey stuff in my rock.. can anyone Id it and help me? 3E2CE591-FE9B-4B2C-BD0F-411D3944C593.jpeg
 
It's a sponge can tell by the holes it made you can leave it or scrape it off that spot it won't hurt anything.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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