Whats the simplest way to keep a sandbed white!?

[Coldwater]

I cant really have a pistol shrimp and goby because my tank is full of fish that would eat them. The tank is a 75 gallon FOWLR. For a skimmer I have a Red Sea Berlin Hang-on Protein Skimmer and for flow I use a Quite One 6000 but with not all of the flow on. 1506 g/h would be too much so I have this nifty little deelie that I turn to change flow. Fighting conches would be a good idea.

Matt