If it were me I would go with 9mm for the euro-bracing. At the center of your span there will be significant pressure to bow and the thicker the brace the better you will sleep at night. You should be able to get a glass company to cut it for you and if you go with a 3" brace you are not looking at that much square footage.
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210 Gallon slowly gaining population.
Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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