keeping sand white

I recently added a tiger tail cuke. It's a 4' tank so will take some time, but I can see exactly where he has been doing his job. Little by little it's all going back to pure white.
 
My (terrible) LFS has some big sand sifting stars in one of their tanks. The other tanks have cyano all across the bottom. Not the one with the sifter stars. It's sand is almost pristine.
 

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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