Is this a sponge?

reef4life!!!

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Hi,what is this white thing on my live rock?It appeard like a week ago. I haven't added anything to the tank.. Last addition was 2 clownfish 2-3 weeks ago, haven't added corals or rocks

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Just grow it: Have you ever added CO2 to your reef tank?

  • I currently use a CO2 with my reef tank.

    Votes: 8 7.0%
  • I don’t currently use CO2 with my reef tank, but I have in the past.

    Votes: 4 3.5%
  • I have never used CO2 with my reef tank, but I plan to in the future.

    Votes: 5 4.4%
  • I have never used CO2 with my reef tank and have no plans to in the future.

    Votes: 92 80.7%
  • Other.

    Votes: 5 4.4%
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