Do you want a Deep Sand Bed or a Shallow Sand Bed?
For a Deep Sand bed I'd recommend 60 - 80 pounds of Dry sand to add during your tank cycle and 20 pounds of real live sand to add right after the cycle finishes.
Real live sand does not have a brand name. It is collected far off shore in a tropical area or in a remore area, boxed and shipped overnight. Saltwaterfish.com sell this type of sand --->
Premium Live Sand