Only 1. Usually a Betta is all that is kept in a 3 gallon tank
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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.
A 20 Gallon tank can hold up to 20 gallons of water.
The mass of a fish tank should be measured in kilograms.
It holds 160 quarts.
192 cups 1 gallon = 16 cups 1 cup = 0.06 gallon