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.
 

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WHAT KIND OF SUBSTRATE ARE YOU RUNNING ON YOUR TANK?

  • Bare bottom

    Votes: 8 16.0%
  • A shallow bed of fine sand

    Votes: 12 24.0%
  • A shallow bed of coarser sand

    Votes: 12 24.0%
  • A deep sand bed

    Votes: 8 16.0%
  • Mixed substrate or varying sand depth

    Votes: 10 20.0%
  • Some other substrate (posted in the comments)

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

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