[psomers]

I've never had a tank problem and never really examined it but I'm guessing the vent pipe and toilet are attached to the top of the tank with solid black pipe. As the tank fills the tank sags in the middle between the supports. It looks to me like the pipes should be cut and then joined with a short piece of rubber hose to allow for the up and down motion of the tank. Those that have been in the area of the tank would that not help?