White haze on inside glass

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ZoWhat

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White haze on inside glass that's very very difficult to scrape off...even with a razorblade. Comes off if the razor is at the correct angle.

What is it?
Seems like some kind of hard calcium

Best way to remove?
Other than the painstaking method of using a razorblabe


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WHAT KIND OF SUBSTRATE ARE YOU RUNNING ON YOUR TANK?

  • Bare bottom

    Votes: 5 23.8%
  • A shallow bed of fine sand

    Votes: 4 19.0%
  • A shallow bed of coarser sand

    Votes: 4 19.0%
  • A deep sand bed

    Votes: 3 14.3%
  • Mixed substrate or varying sand depth

    Votes: 5 23.8%
  • Some other substrate (posted in the comments)

    Votes: 0 0.0%
  • I don’t have a reef tank yet

    Votes: 0 0.0%
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