I haven't read through all the responses ...
5mm isn't that thin. I have an Aqueon 36g bowfront that isn't any different. Only difference is the, I think, tempered face. And if it's not, then it's really strong for such thin glass.
Oh, BTW, yesterday I had to remove 2 baffles in my sump. They were 6mm - 17-1/4 x 16-3/4. I couldn't cut them out, so I tried taping them and WHACK with a wrecker bar edge. No go after many tries. I eventually had to score the panes and then smack them hard enough to hurt my ears.
So, my point is, your 5mm can take a lot
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