Ply wood tank build question.
 

New here, but not new to reef keeping. Currently have a 55 gallon reef tank, but want to go bigger. I sold my 180 last winter when we moved.

Been following the King of DIY on Youtube, and decided to go a plywood tank.

What thickness of Glass should i use, ir will have 2 viewing panels and be approximately 400 gallons.

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Dimensions are 72 inches long, 36 inches wide and 36 inches deep

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At a LFS I worked at years ago we had a 700g plywood tank with one viewing panel. I believe it was a standard 4'x8' piece of acrylic around 1" thick. It flexed outward several inches so we had do some major bracing on top to cure the leaks.

After the modifications it was a great tank.

That was a good bit bigger than what you're shooting for but I guess the point I'm getting at is use the thickest glass/acrylic you can afford. A little overkill won't hurt a thing.