Here's an idea that I use, and will probably get flamed for (but I am getting used to people thinking they know all).
Use the sand as it comes out of the bag, and cover it with an inch or so of #6, or #7 glass beads. Glass beads are dust free so no more silt will come flying out of your sand bed. A very interesting thing is that the snails and my conch like the stuff. They bury themselves to the exact depth of the beads. I can see that because the beads are translucent, so you can see things that are buried close to the front.
It works well for me, so to all you probable detractors I say "try it you may like it" before you pan the idea.
