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Old 07-17-2008, 03:32 AM   #121
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Old 07-17-2008, 02:30 PM   #122
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Well after much talking with other people I have decided to remove the oak from the top of my stand.

Here is a level on the stand and you can clearly see the gap so I think the surface of the stand started the problem...


After removing all the oak the plywood is much better though still not perfect. There is a 1/16" gap in a few places. I put the Hardibacker board on top of the plywood and that reduced the gap even more. I'm still a little jumpy about putting the tank on there and filling it. I don't want another flood.....
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Old 07-17-2008, 03:05 PM   #123
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Thinking about it again, since I'm not sure how all this stuff works, I would think a crack in the bottom would be from previous stress or the glass being weak/not up to the task, like bad temper-ment. Or that bottom middle brace was out of whack a little?

What is Tempered Glass?

This says that tempered glass once broken shatters, also
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Tempered glass might also fail long after the event that caused the failure. Stresses continue to play until the defect erupts, triggering breakage of the entire panel.
Well I guess your tank may be acrylic, then it shows how much of a noob I am, lol
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Old 07-17-2008, 03:09 PM   #124
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No it is glass...and that is the interesting thing about the way it cracked. It is a single crack running from one side to the other not shattered like tempered glass....I don't know but I'm at a stand still right now....
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Old 07-17-2008, 03:13 PM   #125
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hey man all i can say is at least the tank was free and you werent out $350
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Old 07-17-2008, 03:22 PM   #126
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To me the foam, which I'm pretty sure is high density stuff. Like you can jump on it and it deforms only slightly. It would act as a leveling device, which is how/why you were using it in the 1st place, as long as the edges dont dig in so much to be pushing up on the bottom. I assume that since the middle braces look like thin metal and from what little I've read/seen that they only support sides( I know the top one does, just assuming the bottom brace is the same/similar). So in fact the bottom glass is supporting all of the weight, you would think that the seems would leak if it was not level before it would crack or break.

You may never know what exactly caused it, maybe if you looked closely along the crack with a magnifying glass, you could possibly see some small nicks near the "fault line" (crack) that are not part of the actual crack. Then you could assume this was from some impact and what caused the stress(at some time previously). Alternatively if the crack did start at the edge, then I guess not being level could be the cause.

Did it recently have water before you got it? How old was the tank?

Any way, I think it was more of a random incident, and your methods seem sound to me.
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Old 07-17-2008, 03:32 PM   #127
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I just got off the phone with Perfecto and they say DO NOT put foam under their tanks. The plastic trim on the edges and the center are designed to hold the tank. They recomend of course buying their stand with the tank but say that the tank needs to be sitting on a flat level surface with all points of the trim touching that surface.

So the foam is out and it is time for me to make sure that the top is flat and level...
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Old 07-17-2008, 03:33 PM   #128
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was this a diy stand or did you buy it?
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Old 07-17-2008, 03:41 PM   #129
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Plastic in the middle is not holding anything except the sides from bowing out from what I can tell. The glass is holding all the weight the plastic is just to keep it "square" for the seals. They prob also cant be sure how good of foam your using either, as I'm sure there are many types of thicknesses/densities, but neither you nor I know how good it is either, lol.

I guess its time to find the perfectly level wood or get the sander out
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Old 07-17-2008, 03:43 PM   #130
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Well if i had to take a stab at this crack thing i would say it was a combination of the foam and when you put it on the stand. If you put it down a bit hard and one corer hit before the other it would put a deeper indentation in the foam then the rest. So when it was just sitting there one corner would be lower then the other three so when you filled it with water it would be like if three corners were on the edge of a counter and the last one is hanging over and then you put all the weight in the corner from the water and rock and it would crack right between the two corners that were supported on the "edge of the counter". It wouldn't take much bend in the bottom to crack the glass.
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