How to build bare bottom tank

Hi guys, I just wonder how to build bare bottom tank without any strengthening on the bottom? I have my planted tank 120x45x60 cm and I have stripes of glass all around bottom. I have talked to guy who made it for me about making 120x60x60 tank for breeding, and I want it bare bottom... But he refused to make it without those stripes even if it is made from 1cm thick glass... He tells it won't hold without those supports. How are your bare bottom tanks built? Totally without supports or some other supports which are not inside tank? Thanks a lot

WOW thought about this one but decided against it,forgive me

Jeanne

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So no supports needed?

No.