Black spot at base

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jsanbor1

jsanbor1

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Is this black spot at the base here anything to worry about? Any advice is appreciated.
 
Saltwater Aquarium
Nutramar Foods

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  • Pods and other tiny life on the glass or rock

    Votes: 12 38.7%

  • Worms, brittle stars, or other cleanup crew

    Votes: 14 45.2%

  • Crabs or shrimp out and about

    Votes: 9 29.0%

  • Bioluminescence (actual light produced by organisms)

    Votes: 0 0.0%

  • The tank looks pretty much the same to me

    Votes: 1 3.2%

  • I rarely look after lights out

    Votes: 5 16.1%

  • Other (Post in the comments)

    Votes: 1 3.2%
See comments…

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