Your tank is commonly known as a 120g, glass cages calls thiers a 125g tall. Actual volume is about 115 gallons.
If you want actual volume you need to go with inside dimensions or subtract the glass thickness.
Onion01;1102958; said:Tank Gallons = (Height in inches x Length in inches x Width in inches)/231
If you want actual volume you need to go with inside dimensions or subtract the glass thickness.