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 MOST OFTEN MAKES YOU REACH FOR YOUR CAMERA AROUND THE REEF?

  • Coral behavior (feeding, extension, or movement)

    Votes: 0 0.0%
  • New growth or a color change

    Votes: 2 11.1%
  • Unusual fish behavior

    Votes: 0 0.0%
  • The whole tank looking especially good

    Votes: 6 33.3%
  • Something I want to document in case it changes

    Votes: 1 5.6%
  • A funny or unexpected interaction

    Votes: 2 11.1%
  • I usually put the camera/phone down and just watch

    Votes: 3 16.7%
  • Other (Post in the comments)

    Votes: 4 22.2%
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