Something growing on the side of acan

stacye

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I tried searching before posting. I’ve noticed this black and white thing on the side of my scans for a couple weeks now and not sure what it is?? It’s really cool looking and managed to get a video of it opening up.


EAFF4DB9-BB29-4C38-B2D3-84889A04A06C.jpeg
 

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

  • I currently use a CO2 with my reef tank.

    Votes: 8 6.1%
  • I don’t currently use CO2 with my reef tank, but I have in the past.

    Votes: 5 3.8%
  • I have never used CO2 with my reef tank, but I plan to in the future.

    Votes: 6 4.6%
  • I have never used CO2 with my reef tank and have no plans to in the future.

    Votes: 106 80.9%
  • Other.

    Votes: 6 4.6%
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