i had to drain the tank 3/4 of the way. i was being an idiot and pushing a heater against the back while holding the front and DOH, the brittle middle brace broke and the tank flexed out about 1/2 inch at the middle. new rim was 10$. i set a 29 on the floor and drained some water into it then started to try and get the rim off. i pushed i pulled i yanked couldnt get the thing to pop.
ended up just breaking it off in pieces. funny think is when i was moving a 65 tall i popped the top rim free with barely any pressure,heh go figure the 55 wouldnt budge because i needed it to.