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I've noticed that when some tanker's give their size of aquarium in gallons and the size in inches they don't equal. As an example a 48" X 18" X 24" divided by 231= 90 gallons outside measure. So to get a true reading using this formula, we need to inside measure and the hight would be the water hight. The actual gallons before we put in rocks and animals in. If you have a large sump(say 30 gallons) that gives you 240 lbs of rock volume + or - and brings your total gallons back to 90. If you don't have a sump, the formula helps you to know how many gallon's of water you have for proper dosing. If you have a large aquarium the formula is 4' X 2' X 1.5' X 7.5 = 90 gallons. You can measure any water vessel using these formula's. A round tank is circumference" X 2 X hight" divided by 231. I don't want to start a war as like when we by lumber we pay for a 2"x 4" and only get a 1 3/4" x 3 3/4.:neutral:
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