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'glad I'm not your downstairs neighbor.I am going to remove the top rim of a atandard 48" 55.
OOH! I want a football-shaped tank! Superbowl.This tank would be football shaped in short order and then fail.
dantimdad
google for a rimless tank calculator.
It's called AquaCalc and it's free to download it.
I ran the numbers on this and it ain't pretty:
recommended safety factor 3.8 or more
With your thickness (given standard 55's usually are .25"):
side safety is 1.71
This tank would be football shaped in short order and then fail.
You can get some 2" wide strips and some rtv silicone (much stronger than aquarium grade) and silicone them inside the top edge (no need to do the ends really as it would only leave 8" unbraced) and would probably have no deflection at all.
I have done this before to a 30XH and it was rock solid.
Hope this helps.
dantimdad