The leak has stopped after the water leaked down to about 3/4 full. I've made a brace to squeeze the corner a bit to attempt controlling the leak until I get a place cleared for a 55G. Not sure of brand/make/age. The glass is 1/2" thick, it has no center brace like the new 75 Gallon tanks I've seen recently. We got this tank from Paul Wallace a few years ago, and not sure how long he had it. It's pretty old I'm sure. But not something I can't fix. The top frame has been broken since we've had it, and I'm thinking that may have led to the seal failure. I've been thinking about building a stainless steel frame to install on the top to keep it all squeezed together in the future.
Dennis