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.
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A 20 Gallon tank can hold up to 20 gallons of water.
A bit less than 75 US gallons.
1 gallon = 231 cubic inches Volume of the tank is (10 x 20 x 12) = 2,400 cubic inches The tank has a capacity of (2,400 / 231) = 10.39 gallons (rounded), but we have no way of knowing how many gallons are "in it".
Mine was 20 gallons. depends on the wheelbase the shorter will have a 23 gallon and the longer could have a 23 or 38 gallon tank
20 qts 1 gallon = 4 quarts 1 quart = 0.25 gallon