| Pro is right
Height is the determining factor as well as how many glued in baffles you are using. My sump is 1/4" but is only 12" high. I think 1/4's maximum height is 12" but I am not sure. Found a chart somewhere when I was building my sump but haven't been able to find it again.
It also depends on how well you brace it. If you have baffles every few inches you won't flex but if you have a long unsupported side it is going to flex. I built mine with out anything on top and it flexes if you had a lip of plexi on top it would flex less. My sump fits tight inside my stand so I new the front and back of the sump would be supported so i could get away without a top to hold the sides.
I think you would be okay in 3/8's too.
Tom
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