Small curved red lines

BoxersOrBReefs

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I downsized my neglected tank today to something more manageable, but I see these small red lines in the sand near where I placed some old hermit shells. What are these?
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IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%

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