Swirl trail on glass

Reefnski

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Hi all, I have a tank that suddenly has this swirl trail on the back glass. Does anyone know what this is? It showed up this morning. The only thing in the tank is a lawnmower blenny, snails, hermits, a couple zoas, and oodles of copepods.

IMG_0517.jpeg
 

Making aqua concoctions: Have you ever tried the Reef Moonshiner Method?

  • I currently use the moonshiner method.

    Votes: 3 33.3%
  • I don’t currently use the moonshiner method, but I have in the past.

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  • I have not used the moonshiner method.

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