Can someone tell me what this is?

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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When to mix up fish meal: When was the last time you tried a different brand of food for your reef?

  • I regularly change the food that I feed to the tank.

    Votes: 44 21.7%
  • I occasionally change the food that I feed to the tank.

    Votes: 70 34.5%
  • I rarely change the food that I feed to the tank.

    Votes: 66 32.5%
  • I never change the food that I feed to the tank.

    Votes: 19 9.4%
  • Other.

    Votes: 4 2.0%
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