I have recently been given this very odd long octagon tank that I aim to turn into an indoor aquaponics system. The trouble is that the man who made it so many years back for my mother-in-law has since passed away and she has no idea the gallons of the tank. Now, I remember basic math and volumes and with the help of some online tutors and some google unit conversions I calculated that the tank is 121 gallons. But that just doesn't seem right. It appears closer to a 50-70 gallon tank in my opinion. Does anyone have any advice on figuring the volume of an octagon tank that doesn't have equal sides? I would greatly appreciate any advice. The measurements are in inches. I apologize for not having a photo of the tank itself but I have not relocated the tank to my home yet.
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