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
 

Building with glass and silicone: Have you ever built a tank or had a custom tank built?

  • I have built an aquarium.

    Votes: 5 14.7%
  • I have had a custom tank built.

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  • I have never built a tank or had a custom tank built.

    Votes: 20 58.8%
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    Votes: 2 5.9%
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