Can someone tell me what this is?

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DChen

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A few have been growing in my tank and ive removed some just incase. Should i be worried about these or just let it be?

Tanks a 40g and about 8 months old IMG_2584.jpeg IMG_2585.jpeg IMG_2586.jpeg
 

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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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