Well, let's put it this way: if the water was put in gallon jugs and placed side to side, they'd stretch 540 miles, or all the way to Knoxville Tennessee. I'm not a mathematician so I'm not sure of the width of a gallon jug. Any guesses as to the amount of salt????
More useless Coral Reef Trivia: The aquarium walls are 18 inch thick panes of glass. They are held in place strictly by the weight of the water!