so this build is in the distant future but ive been doing a lot of thinking about it lately and was wondering, how do you get glass in a concrete tank, tank is going to be in the basement, dimensions 10 ft wide 14ft long and about 6-8ft deep, any clue as to how thick i would need to make this glass? im thinking two viewing window in the front about 5ft by 5ft. would a 6 inch overlap on all sides of the glass suffice?