Glass bows make me so nervous. When I filled my 110 gallon with 900 lbs of water for the first time my legs felt weak. It just seems wrong to see 1/2" thick glass bend! I measured my tank, it is 1/4" wider at the centre than at the ends. My tank has an extra glass brace on the long edges at the bottom of the tank but none at the top. All the glass thickness charts say 6mm is the correct thickness for your tank dimensions, so I wouldn't worry about it. Personally I'm more worried about my seals than the glass.
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