It is odd that it just cracked, as I believe all Perfecto tanks have tempered bottom panes, should have blown out.
Possibly they had regular glass used in the bottom instead of the tempered? That would make sense since the bottom would be too thin to support the weight.
Burt
Edit..... Should have checked first... some tanks do not have tempered bottoms (http://www.marineland.com/sites/Marineland/Documents/Standard%20Aquarium%20Specs.pdf).
The 150 tall does not, the standard 150 does, which one was yours?
Possibly they had regular glass used in the bottom instead of the tempered? That would make sense since the bottom would be too thin to support the weight.
Burt
Edit..... Should have checked first... some tanks do not have tempered bottoms (http://www.marineland.com/sites/Marineland/Documents/Standard%20Aquarium%20Specs.pdf).
The 150 tall does not, the standard 150 does, which one was yours?