A quick tip for preventative maintenance...
There is potential for a water leak to occur from your toilet/tank fasteners. Please see attached pictures of severely corroded bolts vs. one in good condition. These bolts secure the tank to the lower half of the toilet and the bolt heads are visible at the bottom of the tank when the tank lid is removed. Use of chlorine based tank tablets should be avoided as they can accelerate corrosion of tank parts.
Please inspect you tank bolts and replace if necessary to limit the potential for water leaks.