Came home yesterday from my 2 months trip in Europe, when I left, the tank was filled up with water from the rain, Today, the tank is still full and is still in top shape. I had a 75 gal full with greenwater with mosquito larves and dafia. My fish loved a couple of scoops of that live food after 2 months only flakes.
I decided to make an aluminum rim and center brace. I don't know if that tank still can be trusted without braces if I drill 5 holes in the back.