Back in 2004 I managed to stick my foot through the side of a 40g aquarium that was fully stocked
Thought I would be clever cos it lived on the floor anyway and I wanted to move it backwards a bit cos it was not straight in its alcove. It was half empty due to being on water change day
You have never seen anyone move as fast as I did to get towels etc.....hardly any spillage, no fish lost...a very soggy foot and loads of expletives
The entire side cracked and by the time I got back with armloads of bath towels which I put tight to the cracked area, it shattered on that one side
Needless to say I have never tried to move an aquarium with my feet again...or kept one on the floor again either.