Fixing a Seam Leak

[MyNemesis]

I certainly hope that no one EVER has this problem, but the 120 I bought used 7 years ago sprung a leak along the back seam. I tore the tank down. When I took the Durso standpipe out of the overflow while draining the tank and the overflow drained, the leak stopped. So I assumed that is where the leak was, took the overflow off, took out the silicone behind and about three inches on both sides of the overflow and re-sealed it. Filled it up and it leaked. Tore it back down and re-sealed the entire back seam. Worked great for about three hours, then drip . . drip . . drip. Sooo, I was complaining while at Preuss and they shared an idea with me to basically re-make the bottom seal of the tank with a new piece of glass. So here is what I did.
I cleaned the whole tank and took the silicone down to a horizontal level to the silicone between the glass:

Then I got a piece of 3/8 inch glass cut from an old table top 47" long by 6" wide for the 120 which is 48 inches long. I thought that would leave enough room but wound up breaking that piece as it was just too tight. Then I got a 46 inch piece cut and had to have a 3 1/2 inch hole cut in it for the bulkhead to make it flush and seal well to the bottom of the tank. Put it into place after putting silicone under it and sealed it up:

Here's the left side:

Then I reinstalled the overflow and added a vertical piece of glass out of the hunk I broke on the right hand side of the back where the leak seemed to be coming from just to give it a little extra seal:

So here is a photo of the entire seam along the back on the right side of the tank where it seemed to be the leak I absolutely couldn't fix.

As you can see, you are basically creating a new bottom to fix a leak in the seam between the glass. Many thanks to the folks at Preuss for the idea. It's back up and running with nary a drip for five days now, but I wouldn't want to do it again!