Re: Moldy kimchi – HELP!

From Maangchi’s FAQ:

A: If you keep your kimchi properly, it won’t go bad months and months. Don’t forget to press down the top of kimchi in the container with a spoon whenever you take some. It will prevent your kimchi from being exposed to air. If you see the top of your kimchi already has white stuff (mold), remove the top layer of the kimchi and you still can eat the rest of the kimchi.

Or maybe its just the crock? I myself prefer a 1 gallon glass jar to store kimchi in; never had it go moldy.