If you ever hear a slight leaking of water into the tank, then replace the seal. The seal last a long time but will go bad depending on your water type and how much you flush the toilet. The other thing that causes leaks is the round grommet under the red cap. I have 3 of the same toilets all installed in 2011 and only had to replace the grommet on one. I have replaced the canister seals about every 4 or 5 years. So stock up on them and watch the YouTube videos on how to replace them.  Oh, one last thing. Be sure to set the water level correctly in the tank. There is a very small ring around the canister to which the level should be set. The set screw in on the canister lever.