It's all personal preference, from what I've noticed. I use miracle mud for my fuge...it's pretty expensive, though, and I got it because it was when I was first starting out and my lfs convinced me to use it. I don't mind it. At least I don't need a deep sand bed of 5" or more....my fuge wasn't that deep, so i couldn't do a dsb anyway. If you go w/ just live sand, it should be 5" or more to be effective. But you can also do what RIJohn suggested, and just do rubble and a ball of chaeto. Make sure you get a good light, like some type of CFL. At least your pods will have places to grow in.