One of the major reasons for trim on tanks with no center brace is to prevent breakage during transport. The edges of glass are chipped very easily and the tank can be cracked from even a small impact on the top or botton edges. As far as the trims structural purposes there isn't much. If you look at many less expensive tanks the trim is not even joined at the corners but is instead made of four seperate pieces adding no strength whatsoever.
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