PleSe help. What is this

Coug92

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Hello,

i have been travelling and returned to see. Couple of these on the glass. Is it some kind of snail trail? Or an organism? Appreciate the help.

5150FCDE-A67B-4342-AF06-671A5E8C59D9.jpeg
 

High pressure shells: Do you look for signs of stress in the invertebrates in your reef tank?

  • I regularly look for signs of invertebrate stress in my reef tank.

    Votes: 36 31.3%
  • I occasionally look for signs of invertebrate stress in my reef tank.

    Votes: 28 24.3%
  • I rarely look for signs of invertebrate stress in my reef tank.

    Votes: 21 18.3%
  • I never look for signs of invertebrate stress in my reef tank.

    Votes: 30 26.1%
  • Other.

    Votes: 0 0.0%
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