1 cubic foot = 7.48 gallons.
20 x 7.48 = 149.6 gallons.
You should measure the inside parameters to get more accuracy. My tank is rated at 215g because the manufacturer measures from the ends of the molding. 190g is more accurate for me.
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I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them. -Thomas Jefferson
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