What would be these things?!

mannheimia

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Hello,
I just saw these small things on the tank side and just suprised. What would be these things? Should i avoid them? If they are harm to corals or my fish what should i do?

IMG_20191123_161554.jpg IMG_20191123_161607.jpg
 

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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