Live Rock and sand fs

With moving some stuff around and going with one big sump rather than three I will have some rock I cant fit in… I will have a few hundred pounds fs $3 a pound… I also have a few buckets of sand $.50 a pound

where are you located? How many lbs of sand do you think I would need for a 55 gal ?

We are located in reading pa I have about 200 pounds of sand