I actually didn't even ever find where it was leaking from. It seemed to start directly in the middle of the back panel. I would have had to sand it down and reseal the entire thing. It was too discouraging for me to go on so soon after setting it up and I just never went down that road againDang... This is discouraging. I am wanting to build a corner tank as well and cannot see your pictures but also read through the thread and see this is not up and running. Do the leaks at least have a pattern or are they in just random places?