218 lb.
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Saltwater weighs about 8.6 pounds per gallon, so 25 gallons of saltwater would weigh about 215 pounds in total.
If filled to the top it would hold 6.34 gallons.
A 300 gallon saltwater aquarium can weigh approximately 2,700 - 3,000 pounds when filled with water, substrate, rocks, and equipment. It is important to ensure the aquarium is placed on a sturdy and level surface to support its weight.
One gallon of water weighs approximately 8.35 pounds, so 69 gallons of water would weigh around 575.15 pounds.
500 gallons of pure water weigh 4,172.6 pounds (rounded) With 250 pounds of salt added, the mixture had better weigh 4,172.6 + 250 = 4,422.6 pounds, or else mass has disappeared, which is a no-no.
That depends on the type material you are referring to. Also, these are two different types of measurements. Gallons is a measure of volume but the other is weight or mass. Please edit your question to include more context or details.