White specs growing in tank

tjs1200

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Can somebody identify the white spots on the rock and side of the tank? It is hard and all over the tank. They have been growing and multiplying over time for the past four to six months, thank you in advance.

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Jekyl

GSP is the devil and clowns are bad pets
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Have some white light photos?
 
OP
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T

tjs1200

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Jekyl

GSP is the devil and clowns are bad pets
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Have you been dosing anything?
 

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: 19 29.2%
  • I don’t currently use a HOB filter on my reef tank, but I have in the past.

    Votes: 8 12.3%
  • I have used a HOB on fish only or quarantine tanks, but not on the display tank.

    Votes: 17 26.2%
  • I have never used a HOB on a saltwater tank.

    Votes: 20 30.8%
  • Other.

    Votes: 1 1.5%
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