Does anyone recongnize what this is?

CoralLove9552

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Not sure if I should be worried or not. Found this in my tank. It is hard & I have scoured online but cant figure out exactly what it is. Thank you all for any insight you can provide!
 

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

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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