The reason for the leak
by, 03-28-2012 at 01:58 PM (4910 Views)
I'm not a tank builder so I don't about stress tolerances, but I did find why the water was coming out of the small hole in the seam. Here's the hole.
The inside of the end of the tank with the external overflow is covered with a black acrylic panel which is really just for looks like a facade. The glass box should hold the water. However, somehow the end has given way.
The water getting behind the black overflow doesn't really matter, but the splitting of the vertical seam in these pictures is what allowed water to leak out of the tank.
In this picture below you can see how panel has stretched away from the glass end panel.
Now that water has flowed down within the silicone seam, I don't believe it will hold if mended. If water can channel down and find a gap, it won't tighten up later magically.
And here's an area where the silicone has turned white, which usually means it doesn't have the strong adherence we rely upon.
At least I know where the water came from, exactly.