07-29-2012, 08:04 AM
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How old is the tank? I just replaced a 15 year old 55 gallon because the top frame was splitting nearthe center brace. People suggested I get a new top molding, but after a certain point it's safer to replace: the sealant doesn't last forever and I was a nervous wreck wondering, each time I came home from work, is there gonna be fifty gallons of water all over the floor?
I also gave an old 125 gallon tank to a friend because after a respectable run, the glass had a lot of scratches and I no longer trusted it. He was gonna use it for a Water dragon and stash the tank in his basement, so that seemed like a good use for it.
When it comes to trying to stop a leak in a smaller tank, I'm all for giving it a go. I hope you find a solution that works for you, but I would never attempt a repair of this kind on so large a tank. The amount of pressure on the seals is so extreme, and the unlikelihood in getting a good seal without first cleaning all the surfaces to be joined makes me think the project is doomed. But believe me: I'm sympathetic because 125s don't come cheap.
I will continue to watch this thread, because I want to see if anyone has had success doing this, and meanwhile I wish you the best . . .