I look at it like this : if it came with a rim around the tank it's there for a reason ,
removing said rim can cause catastrophic failure , along with voiding any warranty the tank may have ,
think about the big mess if the tank fails , my tank didn't fail structurally but my sump did over flow it was not fun cleaning up the big mess I got up all the water but it seemed more water would build as it sat it took over a week to suck up every drop of water out of the carpet , now I'm going to be replacing the carpet as it has a musky smell , it is a costly risk if it fails it's not worth the risk !
If you want rimless tanks you should buy them that way , as they are constructed a little differently and are built with thicker glass than most tanks,
there's also the choice of seamless vinyl tanks
Fish are like lifesavers
They come in different colors