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
 

Algae invading algae: Have you had unwanted algae in your good macroalgae?

  • I regularly have unwanted algae in my macroalgae.

    Votes: 31 34.8%
  • I occasionally have unwanted algae in my macroalgae.

    Votes: 20 22.5%
  • I rarely have unwanted algae in my macroalgae.

    Votes: 8 9.0%
  • I never have unwanted algae in my macroalgae.

    Votes: 5 5.6%
  • I don’t have macroalgae.

    Votes: 22 24.7%
  • Other.

    Votes: 3 3.4%
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