So exactly how does a thin layer of elastic rubber. Or whatever save a tank from an earthquake magnitude of like 7 was it?
I don't think his showroom was near the epicenter of the earthquake. Though I'd be worried if the tanks had gone through that stress.
Here is a map of where the epicenter is, and Niigata is where ADA is headquartered, there is a good 250 miles between the two points:
I have a foam mat under my 17G 60-P as well, just a peace of mind.
It wouldn't be hard to put the mat under your tank now, just drain most of the water, have someone (or you) lift it up, someone else slid the mat underneath, put the tank back down, cut the mat following the tank edge.