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Old 04-16-2007, 11:28 PM
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12mm - 1/2" is good for up to 26" high. If you go over 6' in length then things get somewhat more tricky due to deflection.
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Old 04-17-2007, 02:26 PM
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Better to go with the thicker glass I guess, don't want any accidents. Thanks everyone.
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Old 04-17-2007, 04:43 PM
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i'd say 9 or 12mm sides and a 12 or 16mm bottom with a very strong sheet (3/4") of plywood underneath. Thicker glass also provides more surface area for the silicone, allowing a better margin of error in case one makes a boo-boo.

when you increase both your distance side to side and front to back, you need a thicker glass because even though there's head pressure pushing to the sides, there is still a lot of pressure going straight down. The sides are keeping the water in the tank, thus causing gravity to push all the water down.

better safe than sorry
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