I just checked and the leak appears to be coming from the bottom seam. I can't get any putty onto it with the trim in place. Will have to hope for the best tonight and try draining it in the morning. Thanks, I'll have a look and perhaps I can just putty it if I can figure out whats going on. I did have a look at the silicone inside the tank, it seems to be intact so I'm not sure if the two glass panes are pulling apart at one spot or what
