Black spot on Montipora

Rconner15

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Hi all! I noticed a dark spot on my montipora a few weeks ago. I'm not sure if it's something to be concerned with. Whatever it is, it doesn't seem to be progressing quickly. Could this just be new growth? Or is it some kind of pest I need t worry about?
 

Keeping it clean: Have you used a filter roller?

  • I currently use a filter roller.

    Votes: 49 29.9%
  • I don’t currently use a filter roller, but I have in the past.

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  • I have never used a filter roller, but I plan to in the future.

    Votes: 45 27.4%
  • I have never used a filter roller and have no plans to in the future.

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