I had this same issue with a 72"x18"x24". I dropped the water level down until the section of glass moved back to where they needed to be.
I then cut away the silicone, cleaned and reapplied. Waited a week, as this was the 1st time something like this had happened to me. then filled the water back up slowly - watching the tank to check for movement.
For weeks afterwards I'd go to bed - wondering... "Is the tank gonna be safe?" but it was. Infact it has since been moved to my new house and setup again. No issues in over 4 years since it happened.
Hope this helps.
I then cut away the silicone, cleaned and reapplied. Waited a week, as this was the 1st time something like this had happened to me. then filled the water back up slowly - watching the tank to check for movement.
For weeks afterwards I'd go to bed - wondering... "Is the tank gonna be safe?" but it was. Infact it has since been moved to my new house and setup again. No issues in over 4 years since it happened.
Hope this helps.