Woke up to a NIGHTMARE!

[Tikibirds]

Wow, Arent the walls designed to withstand so much pressure though?

[lvandert]

There also could have been a flaw in the glass we didn't see

[Shirleythebetta]

Uneven floors can cause it or just a weak piece of glass. Every pane of glass has a weak point but yours could have been a manufacturing boo boo. My brother put his hand through my 10 gallon tank I was keeping gerbils in. He barely tapped it and his whole hand went all the way through. Needless to say my gerbils had a glass tank with one side made of plexiglass and tape.