I'm sorry to hear about your tank but this is one of those things that never should happen if we made a list called "Learn from my mistakes." I've never made this mistake because I was fortunate enough to hear about it before I tried it. Just like sticking heat pads to tanks, another no, no.
Anyway this is what mine look like,
I use UTH because as you know heat lamps placed on glass crack glass and you can stack the tanks this way too.
What kind of 55 do you have, high or long?