What is this?

Alex2002

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Hello,

I need some help. What could this be on my coral sand? Is it harmful to the aquarium or can it be left in?
IMG_20240402_142207.jpg
 

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

  • I currently use the moonshiner method.

    Votes: 31 21.5%
  • I don’t currently use the moonshiner method, but I have in the past.

    Votes: 2 1.4%
  • I have not used the moonshiner method.

    Votes: 105 72.9%
  • Other.

    Votes: 6 4.2%
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