Found this on my dry rock

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MysterioMask

Aquarium Advice Newbie
Joined
Jun 26, 2017
Messages
9
I found this clearish structure on my dry rock while cleaning it. It's hard. Is it something I should chip away or just leave it?IMAG2441.jpg
 
Because a lot of polychaete tube worms make their shells out of calcium and organic material. But I don't know if that's it for sure. Just a guess
 
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