What is this growing on the side of my frag?

Philly Reefer

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Its a hard structure. I cant take it out without cutting it
 

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: 14 28.0%
  • I occasionally change the food that I feed to the tank.

    Votes: 18 36.0%
  • I rarely change the food that I feed to the tank.

    Votes: 13 26.0%
  • I never change the food that I feed to the tank.

    Votes: 4 8.0%
  • Other.

    Votes: 1 2.0%
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