How much does a 300 gallon saltwater aquarium weigh?

Answer 1

1 gallon of water = 10 pounds

so the water in the tank is 3000 pounds

but all the rocks and decor take up space so there is less then 300 gallons of water

but the decor and stuff weighs more then water

Answer 2

Roughly 8.5 lbs per gallon. You do the Math.

Answer 3

If you mean empty, it will likely weigh about 300-400 lbs. Full of water a 300g aquarium would weigh about 2800-3000 lbs.