Hey Shelley,
Eugene and I had a discussion to find out how you achieved the crack on a 18 month old tank and we concur that it was the foam that may have caused the crack. Tanks with trims that leaves a gap underneath the tank and stand surface are designed to sit directly on the tank stand surface. If the trim is allowed to sit on foam, the slight difference in pressure may cause stress on the bottom pane and eventually crack. This is just our opinion but I would agree that the foam caused the crack.
Cheers,
Paul
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