I have a rimless tank (48 x 18 x 14 tall) and it's 1/4" glass. It's been full of water for 6 or 7 years, and I bought this tank used. So if you wanted to save some $, it's just a thought. But if you have 3/8", use it. My tank is braceless and has been FULL of rock for most of the time that I've had it. I used it for storing rock and the bottom is a floating bottom.
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