White thing next to Zoa

Nattysreef

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Hello, can I have some help with my zoa. I added a new coral to my tank today and before adding it I did a firm inspection of my tank to see if everything looked okay, and I came across this. Does anyone know what this is. The white thing next to my orange zoa

IMG_20231022_135205.jpg
 

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: 54 25.2%
  • I don’t currently use a HOB filter on my reef tank, but I have in the past.

    Votes: 53 24.8%
  • I have used a HOB on fish only or quarantine tanks, but not on the display tank.

    Votes: 52 24.3%
  • I have never used a HOB on a saltwater tank.

    Votes: 51 23.8%
  • Other.

    Votes: 4 1.9%
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