I once really considered Acrylic myself. I seem to recall in all my reading about tanks in that size range, people said to go with quality material (your builder is using it) and to go 3/4" when dealing with panels that long. There will be some bowing no matter what but minimizing that is key plus the tanks end up looking way nicer with the thicker material in my opinion. The beauty of Acrylic is you don't really need to worry about your back too much when weighing 1/2" vs 3/4" options.
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