You need to tell us how HIGH the tank is !
A 60x20x20-inch fish tank holds 104 gallons.
The tank will hold up to 90 (89.7662) gallons.
As a very rough estimate, I would suggest 40 gallons!
If this is a round tank, 15 feet wide and 7 feet tall, there would be 1237 gallons.
The capacity of the tank is 12.468 gallons (rounded) for each inch the tank is long.
There are 10.935 imp gallons in a tank measuring 1.08 feet x 0.75 feet by 2.16 feet.
Up to 224.4 gallons.
That is 185 US gallons.
Zero. For a tank to be able to hold anything, even water or air, it must be three dimensional, measured as cubic feet However, for 2 cubic feet, there are about 6.23 UK gallons in 1 cubic foot, hence about 12.45 UK gallons in 2 cubic feet.
About 29 gallons
For inches: 392.73 gallons For feet: 678,632.73 gallons.