I bought a 125 glass setup off CL. Good tank, no leaks. This tank was to upgrade my Blk Aro and 4 poly's. They were in a 90 at the time. (still little)
Speed forward to.....Fish in bathtub. Old fish tank broken down, New tank filling wth water. 2 1/2 to 3 hrs into the project at this point.(because new tank was going where the old tank was.) Water almost to the top of the tank and I hear (bad things at this point) crrrreeeaaack, hairline fracture on the bottom corner. The presure from the water weight, caused the bottom of the tank to split in a half circle from the front glass to the side (meaning that a whole corner was baiscally splitting away from the tank.
This was all caused by me not properly securing the tank on transit from the sellers house to mine.

(yes I checked for leaks on pickup)
Not good. Water all over my floor until I got enough of the water out to cause to pressure to subside.
I had to resetup the ol 90 again. A project that I thought was almost completed took me another 2 1/2 hours.

. Laughing is all I could do about it at that point.
Lesson's learned= secure tank better in transit, refill tank before putting in your house, and a must to own a sump pump when owning big tanks.
Good outcome in the longrun. Instead of the 125 I picked up a 180.

Just thought I would share.