Reef Frenzy & Probiotics?

I don't know exactly what the substance is but I've tried several remedies to get rid of it all to no avail.
It's been an on going issue for 2 plus years. At first I thought Diatoms but after the first year I figured no. Then I thought Cyano, treated with ChemiClean, no effect. Then I feared Dinoflagellates but it looks nothing like the Dino's I've ever seen.
I removed substrate completely from one corner added about 2 cups of newly rinsed sand, within a week the new sand showed signs of this stuff and a week after that it was covered in it.
It's brown dusting at first, left alone it gets darker thicker and fine long strings. No air bubbles attached.
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IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%

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