How much weight can a 36 inch aquarium stand hold?

If it's 16" deep (from the wall to the front edge) then you hope it'll hold a 50-gallon tan. The tank weighs around 50 pounds if glass, 30 if acrylic. And 50 gallons of water weighs... 8 pounds a gallon... 400 pounds. So altogether, around 450 pounds, you hope.