white stuff between my rocks

Kobe V²

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Helow,

I have a question, white stuff grows between my rocks. What is this and is it good or bad?

Thank youu !! 126883383_184057516705896_3675363286999144058_n.jpg
 

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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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