When I bought my tank the manufacturer ( in Phoenix, Az.) said they use 1" from 36" to 48" and 1 1/4" from 48" to 60". I had them use 1 1/4" on my 46" tall tank because I didnt want any deflection. Tanks been up for 2 yrs. with no visable deflection.
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600g (96x36x46) FOWLR
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