What is this? Id please

mejiamale

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Saw this growing in my sump. There is like 3 places it's growing. Is it safe?
04a62341767ed5f6481c511040c37baf.jpg
I'm new to saltwater so I didn't know where to look, but here. Thanks in advance.
 

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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