192 cups
1 gallon = 16 cups
1 cup = 0.06 gallon
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A 20 Gallon tank can hold up to 20 gallons of water.
how many gallons of water will a tank that is 5 foot by 4 foot by 8 foot hold
Only 1. Usually a Betta is all that is kept in a 3 gallon tank
Most Aquarist use this rule of thumb to put fish in an aquarium, 5 inches of adult fish for every gallon of water in the tank. The five inches only takes in the head and body. Do not use the tail in the measurement.
Gallons in a rectangular tank =(tank's length in inches) times (tank's width in inches) times (water depth in inches) divided by (231)