Quote:
Originally posted by edandsandy
I will go back to the RC calculator and see if we measured something wrong.
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As a double check against the calculator, the formula is quite easy for a rectangular tank.
Length x Width x Height, than divide that number by 231, the answer will be in gallons. All measurements need to be made in inches, and of course must be the inside the tank measurements, with height being the height at the actual water level. After this calculation, you need to remember to deduct how many gallons your live rock and any overflow boxes take up to figure out how much water your tank actually holds.