I center brace has the net effect of creating two tanks from the perspective of calculating glass thickness.
A tank with a center brace can use thinner, presumably less expensive glass than a tank without a center brace.
Were to provide information, dimensions and glass thickness it is not difficult to calculate.
If your Guru tells you otherwise and you are true believer that is okay I will not argue the point.
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I pretty much limit what I say to things that anyone can easily verify from recognized references or by direct observation. If it is my opinion I say so.