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It may be a crack in the plastic fill tube or the gasket that is between the "fill tube/flapper seal" assembly and the porcelain tank. You can let the tank fill up. Shut the water off. Put a small weight (fishing weight or stone) on the flapper to hold down for a good seal. You then have to wait a day or 2 and see where the the water levels out. If it is 1/2 a tank, then possible crack in the fill tube. If it goes below the flapper then the gasket between the the fill tube assembly and the porcelain. The home centers sell complete rebuilt kits that include all the guts in the tank. You will need to pull the tank off the bowl and you need a very large pair of channel locks or a 14" pipe wrench to lossen the large plastic nut that holds the fill tube assembly.
Ps I have found cracks in the assembly' but could not see it until I took it everything apart.
Good luck !
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