I have seen more than one tanks break from not being supported correctly, including a 55 of mine. Most of the time, it works fine. The few times it doesn't really suck...
Somehow between cleaning the inside and filling it the tank moved a 1/2 inch to the right. Will be doing a massive WC when tank is cycled to remove Nitrates, and can move it back then (no way in hell its budging while full).
Glad to hear it, would hate to have the same nightmare happen to you that happened to me!