~91g
It can't be a 91gl tank, maybe I gave the to many measurements. It has 6 sides and they are al 18" across by a height of 25" maybe what you calculated by half. So I'm guessing a 45 to 46gl tank?
if each of the 6 panels of glass for the sides are 18"x25" it is 100.98 gallons.
Its a 35g hex tank I just got rid of the same one.
With the 18" across each panel and 25" high dimensions you gave, that comes out to 91g.
Are you sure you measured it correctly?
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The problem is that everybody is thinking the wide measurement is across the top but it is the width of one of the glass panels. The glass panels are around 11" wide. The tank is 18" across the top and 25" tall.