pressure of water on glass

Hi all I am trying to make a fish tank and work out the force the water is causing on the bottom of the tank say if the tank was to be unsupported in the middle what kid of force this would be applying to that area of glass.

The fish tank is

23" long

12" deep

15" high

the glass is 0.157" thick.

How would one go about working this out please?.

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