Need Help Identifying

mrshollyc

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Does anyone know what this is growing in my tank? It’s under an arch in a low flow area of the tank. White tubular growth on back rock.

Should I be concerned?

IMG_0390.jpeg
 

Freshwater filter only or is it? Have you ever used an HOB filter on a saltwater tank?

  • I currently use a HOB filter on my reef tank.

    Votes: 52 24.9%
  • I don’t currently use a HOB filter on my reef tank, but I have in the past.

    Votes: 52 24.9%
  • I have used a HOB on fish only or quarantine tanks, but not on the display tank.

    Votes: 50 23.9%
  • I have never used a HOB on a saltwater tank.

    Votes: 51 24.4%
  • Other.

    Votes: 4 1.9%
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