It can have any number of measurements and shapes, and still contain its full capacity of 30 gallons. 36"W x 12"D x 16"H is a very common basic rectangular size
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The official SI unit for volume is the cubic meter, but for a fish tank, I would use liters. One liter is one cubic decimeter (or 1/1000 of a cubic meter).
the fish tank
In the US, a fish tank's capacity is measured in gallons.
Yes, since Guppies and Neon Tetras are small fish (and stay small), there should be no problem with them living comfortably in a 2 gallon tank. You should add a little filter and air bubble combo to keep the water clean and aerated. Since these are tropical fish, you should also add a small heater and a thermometer. Goldfish do not need a heater but tropical fish do.
volume = length x width x height = 20x30x20 = 12000 cubic cm