i have a dumb question(i know there are no dumb questions, just dumb people). Anyway i was given a tank and am haveing trouble trying to figure out what size it is. It's a bowfront so i can't find any way of calculating the volume for it. it measures 21" high 36" long and the width goes from 12" to 15" at the center. i thought it was a 46 gallon but i have a friend who tells me it is larger. Anybody have any idea or anything close to this tank?

