Uhhh, is this bad?

[fkshiu]

Not sure how thick the bottom pane is. The tank's out in the shed and it's too late to head out there with a ruler. I cannot think of what else could have caused the crack, especially with the foam underneath. I took great pains when building to stand to have it perfectly flat and level. I even had a new concrete base poured on top of the uneven foundation to ensure level. On top of that I used an isolation membrane to negate any shifting due to the new concrete curing. On top of that I used porcelain tile for its greater strength over ceramic. In other words, it could not have been what was under the tank.

spencerC, I would not be too concerned about this occuring to you as long as:
1. the stand is properly built and level
2. you use foam underneath
3. you use HDPE plastic to protect the bottom pane of glass.

[Buddyboy]

Sorry to hear about your tank woes fkshiu! Hope your life and your reef are back to normal very soon!

How is the HDPE plastic used? Do you lay it on the bottom of the inside of the tank? Where can I find sheets of this plastic?

Also, what kind of foam should be used? Where can it be purchased? I would imagine this foam would be layed on the outside bottom of the tank?

Best of luck with your tank rebirth!