07-23-2009, 03:13 AM
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Well I did indeed measure each pane and it is solid 1/2" glass. Dunno about tempering... how do you tell?
Anyhow, I filled it to the very top w/o a center brace. It bowed about 3/4" to 1".
I left the tank in my driveway like this for two or three days with no leaks.
I then drained it and made a center brace out of a piece of glass. I then silicon'd it by wedging the brace between the bottom of the frame and the top of each side pane. I let the silicon dry and filled it up. It now only bows .5". Specifically, the depth of the tank at either end is exactly 18.5" and the depth in the very center, right over the brace is 18 15/16".
The silicon did stretch a little, thus the bowing. I added more silicon at the stretch point. It's been two days now, sitting in my driveway, completely full. No leaks and no more bowing. I'm going to let it sit for about a week while I build a stand and move the 55 it's replacing.