keeping sand 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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